1 + 1 = 2
1 + 1 != 3
Similarly if two people say there is no afterlife and there is an afterlife either one is right and one is wrong or both are wrong.
Its because there is a truth that there are false assumptions.
We assume Christianity is superior because we are Christians. Sure there are logical reasons why Christianity is better than Faith X but most people just believe so because they are Christian and it is what they were raised with. I claim the vast majority believe Christianity is superior because of their own pride, for if it is to be false they are wrong, therefore to them they must be gullible and foolish. That’s just not fun. (If you want to get into why Christianity is true we can do that in another thread, this one is why we believe others are false.)
Other religions are wrong because thats the way simple logic works out. 1 + 1 can not equal both 2 and 3 at the same time. One, or both, must be wrong.
So if we assume we’re right, everyone else must be wrong.
So that comes down to why there are other religions. Well people have reason, and people seek the truth. Atheism appeals to people because in it they see the truth of the goodness of reason. New-agey religions appeal to people because they see truth in the existence of the spirtiual side, etc, etc. In it they all seek truth.
God is the truth, the word. All people seeking truth are searching for God.
Yes Satan and his forces do try to influence people’s beliefs. See the Aztec’s ritual human sacrifices. See today’s religiously zealotous slaughter of infants in their mother’s wombs. But when Satan tries to convice us of a belief hes just taking advantage and trying to distort that natural desire God gave us to search for Him.
When the ancients felt the wind blowing they sought it’s source. They can pucker their mouths and blow. Its a simple step from there to assume a being with much more blowing power than they is blowing. Thus they invented a diety in order to seek the truth. (Just my hypothesis.)
The whole I know good from bad thing is a seperate thread too, dealing with something Catholics call natural law. At its essense we all know to do good and avoid evil, and we all can be held at that oligation.
Sorry my post is incoherent, its rather late. I hope I helped explain, or if not I’m sorry.