@red53 You named his faith but did not name your own faith so it is somewhat hard to understand all you were trying to say.
Your Mother in Law was very good to show interest in you and your faith. That does not always happen. However it may come in time through good action and acceptance through the years.
As with many people they become non practicing in the faith they were brought up with for various reasons and then due to other reasons they find their way back to it for various reasons. What counts is good behavior, actions and therefore live and let live.

So that you understand where I am coming from and why I asked what I asked.

I was raised in a home with my Mom being brought up in the Catholic Faith yet because she lost her Mother at age five she knew very little about her Mother's early life in Lithuania . My father with his Mother and sisters escaped from Russia to immigrate into the United States. My grandparents were orthodox Jews. I so appreciate the memories I have of my grandparents practicing their traditions. My father, who did speak Yiddish when interacting with his parents: my grandparents; and his brothers did not practice and participate in a daily or annual way in Judaism. Like many people in different religions they just stopped practicing daily and annual traditions etc. for no special reason. What was important to me was seeing how good they were in caring for all family members, be it there own children/family or their brother and sisters family and as well outsiders from all walks of life.
Yes, faith and religion are personal and a quiet faith through actions are most important.
Each should be able to practice their own faith without fear or tensions. How beautiful it is to show and teach family members that people through their good actions is what counts.
I would imagine that is what you were inferring.