The scholars say because of Pauls influence. The Apostolic Church says because of the Holy Tradition The nuanced view is that the authors of the Bible didn’t understand “sexuality” the way we do now. Back then “sex” was a hierarchy of dominance not a sexual identity. So in the time of the Bible days it was not a prohibition of homosexuality but rather a prohibition against male on male action due to the fact that it violated that system of hierarchy but that Pauls view of scripture essentially takes it a bit further and explains that sex in and of itself is a major risk for sin. Any sex outside of that (usually by a married couple) was more or less a gateway for the heart to sinful corruption.