My daycare has no religious talk or practices, so I have no need or desire to know which, if any, religion my families practice.

If a family has special dietary considerations or requires certain days off for religious reasons, I have no issue accommodating these, as long as I know in advance, and it doesn't interfere with my standard of care. I feel that it is up to the individual family to inform me of these things, not up to me to ask.

Edited to add: I do Christmas and Easter crafts. I ask in advance. My own family has no religion, and these holidays have become a matter of our North American culture as opposed to the religious roots from whence they arrived.