Atheism: Effectively the Same Nonsense

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.