You can't grasp your brain around that idea because that isn't what you have been taught since a young kid, I am assuming. It's probably hard for you to believe Joseph Smith talked to god, Bhudda became the supreme being by individualistic improvement, Native American spirits gave them power when they sacrificed, going on a pilgrimage to Mecca will bring you salvation, or any other obscure religious practice that isn't pronounced in your specific dogma.
People can believe nothing exists because they haven't been given a reason to otherwise. Miracles generally have a logical explanation and are so broad they can be accredited to identified things. I choose to remain humble and open-minded about our origin. I can't say nothing exists, but I can for sure say it didn't happen how the Koran, Bible, New Testament or any other religious document says it did.
Your pastor saying people born in other religions will be forgiven if they have been "good" is very degrading. That goes against all we have ever learned as humans on being logical. Those religions have the same "evidence" of god as his religion does. Brings us back to the most simple minded way of thinking we can obtain. The wheels go round and round.