Who Said Who Was Not a Christian?

Was at the emergency room last night with my mother and brother. The t.v. was on real low. Couldn't hear it and I thought I read that Trump said the Pope was not a Christian. Then I found out that it was the Pope that said Trump was not a Christian. Then I saw where Jeb Bush said he wouldn't question anybody's Christianity.
That was after I explained to my brother how Jesus said we were not supposed to call anyone on earth "Father." That would be because of the priesthood of the believer, so maybe that was why Trump was accusing the Pope of not being a Christian, to gain support from so-called evangelicals.

There was just one mediator between God and man, the Lord Jesus, so according to him no need for priests anymore, that is men called priests that are looked upon as mediators between God and man.
However, the servant of the Lord must not strive. Not going to argue about this. Going to honor everybody. Not supposed to be arguing and fighting about anything. That is not Christian. Correct me if I'm wrong. So anyway, beloved, let us love one another and let us be sure we are speaking the truth in love.