I wanted to try to further illustrate my point here. Yes, this sodomite would try to state that his stand is Scriptural and that no one has the authority to tell him otherwise. You're correct in thinking that he'll try to take that position. However, that's not what 2 Timothy 3 states. It doesn't state that select portions of Scripture are breathed by God and are profitable. It states that ALL Scripture is breathed by God. Including that Scripture that labels sodomy as an abomination and those who practice it as an abomination in God's sight. That's where the authority to reject this doctrine as evil comes from. It doesn't come from a Church bureaucracy or the membership of the Church, it comes directly from God Himself via His written and recorded word.
The bureaucracy and the membership derive their authority from the Word, not the other way around, and when we fail to stand by this point, we wind up with sodomites molesting the altar boys, homosexual marriage being accepted as normal in the Churches, abortion seen as a woman's "right" instead of infanticide and all kinds of other forms of evil. There's sin in the camp and it started when man thought he understood the Bible better than the Author did.