Calling all Jellies, I could use your input on a delicate situation.

A delicate situation has unfolded for me here today. The elderly mother of one of my house/pet sitting clients has invited me to attend church with her. I am not a church goer and consider myself agnostic/atheist, however, I mostly keep that to myself, short of my close friends. I was caught completely off guard and found myself replying, ” Maybe I will.”

Aaaaagh, why did I say that!?
I am not sure how to handle this now. This unfolded during a brief, passing on the road moment this morning , just a slow down, roll down the windows, ” hello” moment, so I didn’t feel that going into my reasons for not attending church were appropriate in that setting.

How would you handle this when confronted with the invitation in the future, which surely I will be.