Really, you have talked to all of them?
I did research them looking for the their answer on that question and each one of them refuses to recognize that religion as being Christian, don’t kill the messenger when it appears that you haven’t researched it.
Wow, you did research on all of them huh? That is incredible. Thank God that these Christian churches are run by people, people who are not perfect and are not going to be in charge of judging people in the afterlife. If I was you, I would concentrate on myself and not run around telling people that they are not Christians. Also, you might want to research Pope John Paul’s comments on the Mormon church.