My personal experience definitely influences my thinking on this. I’m the child of a marriage where one partner became a believer after marriage and I am in a marriage where a believer became an unbeliever. (I am skipping a lot of nuance here.)

I firmly believe no one should be coerced to profess any religious belief under threat of divorce.

I also think 1 Corinthians 7 is the most applicable scripture for marriages where one spouse changes belief.

But I can see how others view it differently.

Me: 44
H: 44
Kids: 20, 16, 16, and 10
Together/Married: 22 years
H announced he was emotionally detached and considering D: 4/4/16
H announced he is going to try to stay and reconnect: 5/1/16