In Christianity, how does someone get into Heaven?

That's rather presumptuous of you. It assumes that you know what it means to be loving and just in the first place, and that you know the value of faith. Some might argue that the fact that he cares about faith is the proof that God is loving and just. I mean, I personally wouldn't argue that, but I could certainly see how others might. Just because you don't see the value of faith doesn't mean it is not valuable in some just way.

Again, some might argue that this is not a flaw, but rather a STRENGTH, and a necessity to achieve a greater good. You don't know!