It's not that he gets a free pass, but that he isn't portraying himself as some holier than thou Christian. The press has always loved to reveal moral hypocrisy all across the political spectrum (see Gary Hart, John Edwards, Cong. Livingstone, etc).
No. In any other election FR would be against a candidate with Trumps values, who supported Hillary Clinton, who was a democrat just a few years ago. It looks like FR has fallen for the celebrity, celebrity that is usually hated on this site. And I say this as someone who will vote for the nominee because the other choice is a nightmare. Trump sleeping around, cheating on his wives with their best friends (he wrote this in his book) is not acceptable just because he brags about it.