Why Does It Always Surprise You?

I am continually astonished to find people who are confused about someone behaving in accordance with their religion.

What's so hard to understand here?

Likewise I am constantly baffled, as an atheist, with the expectation that I confirm to the expectations of someone else's religion.

Then on top of it all, I cannot fathom how many atheists combine those and insist that the religious conform to their expectations of behavior and display no behavior related to faith.