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Contrary to myth, Christianity's concept of marriage has not been set in stone since the days of Christ, but has constantly evolved as a concept and ritual. Prof. John Boswell, the late Chairman of Yale University’s history department, discovered that in addition to heterosexual marriage ceremonies in ancient Christian church liturgical documents, there were also ceremonies called the "Office of Same-Sex Union" (10th and 11th century), and the "Order for Uniting Two Men" (11th and 12th century).
These church rites had all the symbols of a heterosexual marriage: the whole community gathered in a church, a blessing of the couple before the altar was conducted with their right hands joined, holy vows were exchanged, a priest officiatied in the taking of the Eucharist and a wedding feast for the guests was celebrated afterwards. These elements all appear in contemporary illustrations of the holy union of the Byzantine Warrior-Emperor, Basil the First (867-886 CE) and his companion John.
A Kiev art museum contains a curious icon from St. Catherine's Monastery on Mt. Sinai in Israel. It shows two robed Christian saints. Between them is a traditional Roman ‘pronubus’ (a best man), overseeing a wedding. The pronubus is Christ. The married couple are both men.
Another 14th century Serbian Slavonic "Office of the Same Sex Union", uniting two men or two women, had the couple lay their right hands on the Gospel while having a crucifix placed in their left hands. After kissing the Gospel, the couple were then required to kiss each other, after which the priest, having raised up the Eucharist, would give them both communion.
While homosexuality was technically illegal from late Roman times, homophobic writings didn’t appear in Western Europe until the late 14th century. Even then, church-consecrated same sex unions continued to take place.
Prof. Boswell's academic study is so well researched and documented that it poses fundamental questions for both modern church leaders and heterosexual Christians about their own modern attitudes towards homosexuality.
For the Church to ignore the evidence in its own archives would be cowardly and deceptive. The evidence convincingly shows that what the modern church claims has always been its unchanging attitude towards homosexuality is, in fact, nothing of the sort.