Yale historian Dr. John Boswell's exhaustive research on same sex
  marriages by the church was written in his latest book (Same-Sex
  Unions in Premodern Europe) showing church documents of pairs of
  men, and pairs of women, that had received church ceremonies
  of union until about the 14th and 19th century. (Orthodox priests
  were still performing such public marital rites in mountain villages
  of Albania, Montenegro and Bosnia as late as the 19th century.
  Boswell is the chairman of Yale's history department, holder of
  the Griswold Chair in History at Yale.)
    Trying to research this area of knowledge of same sex marriage
  was significantly hampered by the surviving relatives, and cover up
  by those wishing to maintain their acceptance of noted theologians.
  Many lonely researchers who dug into the past found their research
  would be burned by surviving relatives, and the facts covered up
  by myth, to give a sense of continuity being maintain from the very
  beginning, that there was a sin of homosexuality where none existed.
  Unless some of their notes and unpublished writings are found, then
  most of their vast and valuable store of knowledge died with them,
  and the myth lived on.
    Dr. John Boswell in making the book "Same-Sex Unions in Premodern
  Europe," based his study on more than 60 surviving manuscripts from
  the 8th to the 16th century in a twelve year search of Catholic and
  Orthodox church archives. These ceremony of same-sex union were
  identical to heterosexual unions.
    A Kiev art museum contains an icon from St. Catherine's monastery
  on Mt. Sinai. It shows two robed Christian saints. Between them is a
  traditional Roman pronubus (best man) who is Christ himself as the
  pronubus (best man), and the "husband and wife" are in fact two men.
  A same sex "marriage" that is sanctified by Christ. The men were
  St. Serge and St. Bacchus, two Roman soldiers who became Christian
  martyrs. In the definitive 10th century Greek account of their lives,
  St. Serge is openly described as the "sweet companion and lover" of
  St. Bacchus. They were a homosexual couple. Their orientation and
  relationship was openly accepted by early Christian writers.
    Furthermore, the icon has Christ himself as their pronubus, their
  best man overseeing their "marriage". Contrary to myth, Christianity's
  concept of marriage has not been set in stone since the days of
  Christ, but has evolved as a concept and as a ritual, this product
  of evolution has become set in stone in the minds of most Christians,
  where history never placed it. In fact they had the "Office of Same
  Sex Union" (10th and 11th century Greek) and the "Order for Uniting
  Two Men" (11th and 12th century). The very same as a heterosexual
  marriage where a community gathered in a church, a blessing of the
  couple before the altar, their right hands joined as at heterosexual
  marriages, the participation of a priest, the taking of the Eucharist,
  a wedding banquet afterwards. All of which are shown in contemporary
  drawings of the same sex union of Byzantine Emperor Basil I (867-886)
  and his companion John. Such homosexual unions also took place in
  Ireland in the late 12th or early 13th century, as the chronicler
  Gerald of Wales (Geraldus Cambrensis) has recorded. There are lists
  in detail of same sex union ceremonies found in ancient church
  liturgical documents.
    Records were found of same sex unions in such diverse archives
  as those in the Vatican, in St. Petersburg, in Paris, Istanbul,
  and in Sinai, covering a period from the 8th to 19th centuries.
  Nor was this the first such discovery. The Dominican Jacques
  Goar (1601-1653) includes such ceremonies in a printed collection
  of Greek prayer books, but of course these are hidden away to
  maintain the continuity of the myth of sin of homosexuality in
  the bible. The conspiracy has been covered up with enough time
  and voracity to wipe out the truth in the minds of the masses. To
  the point most if not all will say marriage has always been between
  a man and a woman. God made Adam and Eve, not Adam and Steve.
    This cover up has even found its way into the bible itself, where
  words are added to cover up same sex marriages. In the passage:
  1 Sam 18:21 "And Saul said, I will give him her, that she may be a
  snare to him, and that the hand of the Philistines may be against
  him. Wherefore Saul said to David, Thou shalt this day be my son
  in law in [the one of] the twain." The words [the one of] was added
  to cover up the same sex, and polyandrous marriage of David to
  Michal and Jonathan. They had a same sex marriage, and Michal was
  the binding property for inheritance. Women and children were
  property, a marriage was a contract to exchange the property from
  the father to the husband. (The last two words of the verse in
  hebrew are chathan {khaw-than'} and sh@nayim {shen-ah'-yim}
  which make up "be my son in law (chathan) in [the one of] the twain
  (sh@nayim)". Chathan means marriages, son in law, and sh@nayim
  means both of them, twice. David was Saul's son-in-law twice,
  Saul only had two daughters Merab and Michal, and Merab married
  Adriel, leaving only his sons left to marry to make it twice. David
  loved Jonathan and married him along with his sister Michal.)
    The marriage was made binding by the consummation, in the case
  of two men they became each other's property, with the husband of
  the marriage consummating the marriage. In the case of David's
  marriage to Jonathan, David would consummate the marriage to
  Jonathan, they both shared ownership, but Jonathan would be the
  subordinate along side Michal his wife. The marriage between David
  and Jonathan was for love, the marriage of David to Michal was for
  property. 1 Samuel 20:17 "And Jonathan caused David to swear again,
  because he loved him: for he loved him as he loved his own soul."
  2 Samuel 1:26 "I am distressed for thee, my brother Jonathan: very
  pleasant hast thou been unto me: thy love to me was wonderful,
  passing the love of women." The myth that homosexual activity is
  gravely sinful, is a cultural accretion that does not have
  its roots in authentic Christian belief.
    It can be shown that in every instance of the so called sin
  of homosexuality, is in fact in context the giving of the seed to
  other gods, which is the sin of idolatry not homosexuality. That
  in fact the verses normally assigned to the sin of homosexuality
  did not have homosexual involvement at all, but in fact were as
  Chemarim priests doing their religious duties, and worshipers of
  Baal-Molech, Venus and Bacchus rites giving the seed to these
  gods. Those giving the seed and those receiving the seed were no
  more homosexual, than are those drinking the blood and eating the
  flesh of Christ cannibals, they were doing a religious duty, not
  an act of cannibalism or homosexuality in each case. The fact
  that they were using their bodies which were supposed to be the
  property of God and his temple, against God, to worship other
  gods was an abomination, an idolatrous mortal sin. In a theocracy
  this was no less of a crime than treason, which was charged the
  penalty of death. Were this to go on God could be lost in the
  minds of those who worshiped the other gods by using their bodies.
   In the worship of fertility gods such as Baal-Molech and Venus,
  one would have sex, to entice them to have sex to bestow fertility
  upon the land, animals and people.  Since the priests of
  Baal-Molech, the Chemarim priests were males, the seed was given
  to Baal-Molech in sodomy with Chemarim priests and male temple
  prostitutes, often dressed like a woman to make things easier,
  later with females as well. The meaning of the words assigned to
  the sin of homosexuality themselves have in fact been changed
  and their original meaning covered up as well in myth. A Sodomite
  (qadesh) means a male temple prostitute or Chemerim priest,
  and not a homosexual. (A Chemerim priest are the high holy ones
  or consecrated ones mentioned in Zeph 1:4, 2 Kings 23:5,7,10,
  Hos 10:5). Layer upon layer of cultural accretion has been
  placed upon homosexuals to form the myth of sin of homosexuality.
  More and more add on material with the subtraction of facts
  and context has been placed upon homosexuals until the modern
  day Christian takes for granted that homosexuality is a sin.
    With a little logic one can see that the myth of sin of
  homosexuality cannot be sustained. If one assumes God makes all
  people, then there are those born with both sexes (hermaphrodites),
  and they had to be made by God with both sexes. Jesus called
  them "eunuchs which were so born from their mother's womb", the
  modern day term would be intersexuals. If you are born with
  both sexes, then anyone you would have as a mate they would
  have the same sex, anyone they would be attracted to would be
  a same sex attraction. By definition therefore hermaphrodites
  are homosexual, all persons they would have as a mate they would
  have the same sexual organ as them, all they would be attracted
  to they would have the same sexual organ as them, all that they
  would have sex with, they would have the same sexual organ as
  them, they cannot escape the definition of homosexual. If God
  makes all, God makes homosexuals in the form of hermaphrodites.
  If there is a sin of homosexuality, it would apply to those
  creations God made, because hermaphrodites do not choose to be
  homosexual they are born by definition homosexual.
    The Christians will also point out that if two same sexed
  people have sex it is fornication. Beside the fact that it is
  they that in modern times who will not allow same sexed persons
  to get married, so that they will not have the sin of fornication
  in the modern usage of the word fornication, the word fornication
  itself, as the word sodomite, has been covered up in cultural
  accretion and changed to suit this myth of homosexuality. The
  original word for fornication which was, zanah {zaw-naw'} means
  to be a harlot, play the harlot, act as a harlot, to be a cult
  prostitute, again when the accretion is chipped away the context
  points back the the original context of being a prostitute in the
  worship of other gods. This can be clearly pointed out in the usage
  of the word fornication by Jesus himself: Matthew 5:32 "But I say
  unto you, That whosoever shall put away his "wife", saving for the
  cause of fornication, causeth her to commit adultery: and whosoever
  shall marry her that is divorced committeth adultery." Now if
  fornication was having sex outside of marriage, instead of the
  idolatrous act of having sex for the purpose of worshiping other
  gods, then Jesus would not be talking about putting away a "wife"
  for the cause of fornication. If it were a "wife" having sex in
  the modern sense of the words, it would be adultery, not
  fornication, yet both words are used in the same context, clearly
  a "wife" can commit fornication and the modern usage of the word
  is mistranslated.
    When the facts are shown, time and again the theory of sin
  of homosexuality becomes a house of card ever falling before the
  wind of facts. Truth is a crucible in which you place all facts
  and burn away all other accretion until all that remains is the
  truth. When you put the bible through this crucible, one finds
  no sin of homosexuality.