Thank you everyone for responding to this. I have lurked these posts with little time in the last week to respond, let alone even log in. There are some interesting approaches I had not yet considered, such as taking joy in their joy. I am, to some extent, allergic to Christianity. I have greater patience with Catholicism, Judaism and Orthodox, but Christianity, Mormonism and Jehovah Witness members frustrate me. And yes, His parents are concerned with his, my and the kids souls--they send us devotionals in the mail, they pray for us constantly.
I don't know how I will approach this, but I have so much to chew on. I would love to think that I could just say no, but I don't want my not going to influence the kids when what they might need to hear is right there. I do not want to stand in their way. They are 16 and 14, and I was sure to explain to them that I don't want them to make my "excuses" their excuses. My stepdaughter laughingly tripped over the words "theological issues" as i had used that generalization as a blanket of my concerns in regard to the church.
I wish I could hug each and everyone of you. I am sorry for my inconsiderate delay of responding, but I appreciate the sound advice that is on here.