In a word, yes.
We have weekly park days with an inclusive group, and love it. This group has been meeting for five years and has over the years included families from Muslim, Atheist, Sikh, Catholic, Baptist, and Methodist backgrounds as well several families that have never revealed their family's religious background. Sometimes people discuss religious topics in smaller groups. (Not in a clique sort of way, though.) Quite honestly the discussions about vaccination were much more heated than any other topic I've heard discussed. Only once have I ever heard of someone in the group being upset over a comment of a religious nature.
It really just depends on the people in the group and their ability to share the sand box. :)
BTW- AFAIK only one family has ever left the group for a reason other than an out of state move or a major scheduling conflict.