Logic of religion: we have to believe in the unknown because we didn't choose to exist or be born therefore there is an existing system we must believe in. I don't know if its one understandable with the time given in this life but there is an undeniable unknown system that every human must believe in because no human got the choice to choose to be born or not to be born. And so this system exists whether you like it or not, whether you accept it or not.