The potential to be true is there for all religions except those the creator has said he made up.
Anything that can not be proven to exist (and therefore can't be proven not to exist) has the exact same "potential" to exist. If you don't believe me than prove (with actual proof) that there is not a little invisible leprechaun on my shoulder right now. You can't, same as you can't prove that God exists. The number of people that believe in the unprovable has absolutely no bearing on its likelihood to be true or not.
