Your pastor can not promise anyone eternal paradise after death, but he can make you believe that afterlife exists if you let him and
thats all that matters. The whole "premise of the fucking religion" is not the accuracy of it's teachings but willingness to belief its accuracy.
Whether the afterlife promised by your pastor exists or not doesn't matter in the slightest, all that matters is if you believe it or not. If you do, then this does several things:
1) Makes you comfortable death, assuming that you have lived a life that is in line with those beliefs. This means that you will live your life according to those beliefs to the best of your ability if you truly believe in heaven/hell.
2) Makes you comfortable with the death of loved ones, assuming YOU BELIEVE they have lived a life that is in line with those beliefs. This means that people will not only live by their code of ethics, but will try to get others to live by them as well (also ensuring the spread of the religion).
Examples for Christianity:
Matthew 7:12
Matthew 25:34-40
Matthew 6:14-15
Are you understanding any of this?
