My Dad is like this. He also believes that the Earth is flat...
You tell your dad that if the earth was really flat then cats would have pushed everything off of it by now!!!
Well clearly the Earth isn't "flat", but clearly the bible does say what the man claims it says.
God burned two cities to death because they were filled with Sodomites. In a lesser known section of the bible, all the tribes of Israel gathered together to destroy the City of Benjamin because Sodomites had attempted to rape a man who traveled there, but contented themselves with murdering his woman. The combined forces of all the tribes of Israel destroyed the city of Benjamin, and there slew everything that drew breath.
And yes, Leviticus says they need to be killed.
The more i've been seeing of the Gay Mafia these last few years, the more i'm beginning to believe the Bible had it right.
Your dad thinks the Earth is flat and his son thinks the Bible is a fairy tale?.
Have you even read Lavitisu 20:13? God calls them an abomination ... do you know what THAT means?