How do I get in to heaven?

I think it is too bad that you knew neither the Qur'an or its history well enough to answer their questions and that you did not ask them any about contradictions in the New Testament. Oh well, your loss. You are not on your way to heaven yet. You still have to discover truth and you have not yet done so. You have merely traded one set of faulty doctrines and misinterpretations for another.