The crucial difference between math and religion is that no one discounts the previous/parallel math as being untrue. Newtonian physics still holds as valid for large distances and lower speeds even though we use Einstein-ian physics for small distances and high speeds (closer to light).
You don't seem to grasp that even though Christianity and Islam, for example, are extremely close a Christian discounts Islam as being absolutely UN-true. Penn's point is that we would MAKE UP some religion, find a Bible somewhere and discount it as being complete untrue in favor of our new made up fantasy.
You don't seem to grasp that even though Christianity and Islam, for example, are extremely close a Christian discounts Islam as being absolutely UN-true. Penn's point is that we would MAKE UP some religion, find a Bible somewhere and discount it as being complete untrue in favor of our new made up fantasy.