" So how do you find out what God thinks? The Christian says, you look in the Bible. And the Bible tells us that God forbids homosexual acts. Therefore, they are wrong.

So basically the reasoning goes like this:

(1) We are all obligated to do God’s will.

(2) God’s will is expressed in the Bible.

(3) The Bible forbids homosexual behavior.

(4) Therefore, homosexual behavior is against God’s will, or is wrong. "

― William Lane Craig