Character And The US Presidency

Anyone who knows me knows that not only that am I an atheist, I am also an anti-theist.  That said, today I heard Donald Trump say in front of a gathering of Evangelical Christians that we don't know anything about Hillary Clinton's position on religion.  Hello?  Since she has been a public figure, she has been well open about her background as a Methodist and her beliefs regarding social application of such.  What do we know about Trump's background regarding religion?