I was brought up Jewish and went to Sunday school from kindergarten. By the time I graduated high school I had it with the organization on either the Reform, Conservative or Traditional levels. What I was left with, and retain, is a belief in God. That has been something I have relied on, fallen back on, sought out in various ways and in various denominations over the years.I really think folks who are religious should ask themselves how they would feel about their religion if they hadn't been exposed to it until they were say 15 or 16. I bet very few of them would buy into it if that were the case.
My husband was brought up Protestant. We agreed to bring the girls up in a church but also exposed them to Jewish services, traditions and food. For the older one, nothing stuck and she declined to be confirmed. The younger one clicked. She was going to services, usually Mass, at least thru college. For her it is a support.
The irony is that older one is dating a Jewish guy. It is that component of her upbringing that she using at present.