Because the entire civilization you live in, and the country of which you are a citizen, and the very existence of posterity, are threatened by the homosexual agenda.
"God who gave us life gave us liberty. Can the liberties of a nation be secure when we have removed a conviction that these liberties are the gift of God? Indeed I tremble for my country when I reflect that God is just, that his justice cannot sleep forever." -- Thomas Jefferson
Can gay people not be conservatives?
No, by definition.
Were they born that way or is conservatism a choice?
That particular contorted non sequitur makes my brain hurt.
Ahhh, so you are in search of the “perfect race” of conservatives with absolutely zero flaws. Good luck with that. The Pharisees didn’t like Jesus to much because he associated himself with tax collectors and sinners. You would fit in with them well.