My wife doesn't want me to tell our kids I'm atheist until their 18.. I have till morning to creatively avoid the god question or she wants to kick me out, please help.

I came out as atheist about 2 yes ago. She is still a theist though no longer Mormon. She wants me to lie to the kids if they ask me what my beliefs are. Looking for creative ways to answer my kids without lying to them.. help!!

Edit: they're not their. I was swiping fast.