I agree it's a valid point.
Still, many of us believe God exists, and if He does exist the author has some valid points. Then the author asked those who support homosexual marriage:
Is this phenomenon a cruel joke or a medical anomaly?Of course I could be wrong, but to me it appears the question is directed at those who believe in God. Whatever it is, for those who believe in God it's a valid question.
I think it's a valid question for everybody, believer or not.