So how do you decide if someone is a Christian? This cuts to my deep suspicion of evangelicals. They're too much like the Pharisees who caught Jesus' ire calling everyone else sinners. Bigotry is NOT a Christian trait. We're not deciding if someone is going to Heaven or Hell; we're electing a president! I can think of some fine Hindus and atheists, and some rotten "Christians."
I'm a Christian, but some people of my own faith do us more harm than any atheist could dream of.
Then go ahead and do it your way. That’s why they make chocolate AND vanilla.