B.S.
Hello S.,
Go to http://www.mops.org/ , go to the Groups link on the lefthand side, and click How to Join Group. It should walk you through it. You should be able to put in your zip code and several churches near your home will appear. You can just pick which denomination you prefer. Not to worry about not attending the church either, a friend of mine told me that not all of the mothers that join a group within a church are active members. Good luck and blessing to you and your family!
I hope you find good fellow Christians that you'll be able to form strong bonds with. Take care!