A quote from PBS.org
"It is undeniable that relationships we would call homosexual, especially between men and youths, played an important role in Ancient Greek society. In cities such as Sparta and Thebes, there appeared to be a particularly strong emphasis on relationships between men and youths, and it was considered an important part of their education. On the night of their wedding, Spartan wives were expected to lie in a dark room and dress as a man - presumably to help their husbands make the transition from homosexual to heterosexual love."
Another quote states:
"Second-century writer Athenagoras charges that some at that time had set up a market for fornication, and established infamous resorts for the young for every kind of vile pleasure. Included in this market that publicly sold illicit sex was the theater. The themes of the shows dwelt on the immoral love life of the gods. The performers often dressed in close-fitting dress that gave the appearance of nudity. Additionally, on the walls of homes and temples, often in full public view, were paintings of indescribable lewdness, at times even portraying sexual intercourse. The statues of the immoral gods, often portrayed nude, were in public view for even the youngest of eyes. Also, literature containing some of the filthiest language and descriptions ever recorded circulated freely among the youth. Minds were contaminated from an early age by reading, or by having others read to them, the escapades of the gods and goddesses.
Add to this the very popular public baths, used by the masses, which were considered little better than houses of prostitution under a respectable name; the gymnasiums, where many young and old men exercised in the nude, and which became dens of homosexuality; and the festivals, which were often just public sexual orgies. The situation became exactly as that described in the apostle Pauls letter to the Roman Christians. Referring to those who rendered sacred service to the creation rather than the Creator and who followed the then-current morals, he wrote: God gave them up to disgraceful sexual appetites, for both their females changed the natural use of themselves into one contrary to nature; and likewise even the males left the natural use of the female and became violently inflamed in their lust toward one another, males with males, working what is obscene. (Rom. 1:24-27) Pauls description was shockingly accurate, for the moral depravity of the Graeco-Roman world led to one of the most disgusting practices in historythe sexual abuse of young boys by older men. This filthy practice was glorified by poetry and plays, and the whole society was infected with it."
To conclude....even if homosexuality was commonly practiced and considered "sacred" to pagan gods...it doesn't mean it was accepted by the God of the Bible. In fact, after listing the type of immoral persons that filled the ancient city of Corinthfornicators, adulterers, homosexuals and the likethe apostle Paul, in his letter to the Christian congregation located there, wrote: That is what some of you were. But you have been washed clean. (1 Cor. 6:9-11) The teachings of genuine Christianity had imparted moral strength so that its adherents could change and stay free of sexual immorality.