Well,let's be clear, it has nothing to do what with I believe or anyone else.....it all depends upon what God says.
But that said, one of the basic principles of Christianity is that Jesus Christ is the only way to eternal life, and that other faiths, which say different, are, by definition, not true. If one is a Christian, one believes in Christian principles, necessarily. You aren't willing to allow that, or entertain it, and you would have Christians behave as non-Christians just to satisfy YOU. So yes, your mind is closed, and in particular to Christian doctrine.
Not at all, If what you believe is right for you, thats wonderful that YOU have that faith as a comfort. But there are no absolutes when it comes to religion because frankly, it is not logical, so in honesty, it can not be debated, logicaly. Religion is a belief, and no two people are gonna belive exactly the same thing that is based soley on faith.