You create a concept of "heart of the faith" to diminish the moral authority of the faith. In your mind, anything that is "inside the faith" but outside the "heart of the faith" can be safely disregarded, and no one need worry about it. You thereby try to diminish the scope of faith (for example, to exclude homosexuality and abortion). It is a debate trick, and it is disingenuous. The faith is the faith.
No one who believes in Christianity uses this concept of "heart of the faith" unless they are trying to find an excuse for their inability to believe in all of the faith. So, only those who stand against the faith use that concept to debate.
This message has been edited 1 time(s).