But it's actually a good questions which many unbelievers ask.
Is there a waterproof christian answer to this?
I mean if we say that God judges those which never heard the gospel according to their hearts then they might also say that thise proves that it's all about being nice and loving and then you get to heaven no matter if you are muslim or buddhist or whatever.
This doesn't make sense to me. The bible says there is not one who is righteous then HOW can somebody who lives at the end of the world have a good enough heart to make it to heaven?
Or even if some tribes worship and recognize a creator then it's not God, they worship their idols and this also doesn't please God. So even if they recognize their must be a God then how does this save them when they worship other gods but not God? Have you ever seen a tribe somewhere in the jungle where they worship the God of the bible and not some idols?
I wonder where they even get the ideas for these idols, wether they make them up or wether demons inspire them and teach them what gods there are...