If you think about how we spend the hours of our daily lives, you can see how religion has become irrelevant for all but those raised on it.
We sleep 8 hours, we work 8 hours, religion has little place in a secular work environment that stresses inclusivity for all and focusing on the task at hand.
What do we human animals mainly want to do with our other hours of free time. Well, we must shop for food, clothes and supplies, we must cook and feed ourselves and our families, clean and groom our bodies and homes. We have a few hours left over after that, perhaps 4 hours a day or so. We want to spend them enjoying ourselves. We want to spend them, reading, watching plays, either live, or in the cinema, or on TV. We want to listen to music or practice and appreciate our own arts, crafts and hobbies, and sports. We've worked hard all day and we think we've earned it.
That is our down time, our time for pleasure (oops, almost forgot sex!). We want to socialize with our friends and if we are young people in late teens and twenties, our prime animal motivation is to find a partner and mate. That is all as it should be.
We don't want what little free time we have to be spent in a stuffy hall, being made to feel guilty, ashamed and bad about ourselves, being serious all the time and being told what to do by others who we know are often less ignorant and less educated than we are.
Young people often don't have all the superstitions our parents were raised with. They have already been debunked and disproved. They don't go to bed fearing demons and needing talismen to protect them. They don't have a lot of big unanswered questions. If they have a question, they can get an online encyclopedia and have it answered instantly to the greatest degree of scientific knowledge that exists at that moment. If the answer is not yet known, then it is not known and they can accept that, and don't feel the need to go to a church to have a story made up about it.
Sometimes, older people, whose kids are grown, whose careers have peaked, who are starting to age and deteriorate, begin to get more reflective and muse on spirituality and the greater meaning of it all, if there is any.
Even most of these older ones, focus more on spirituality than religion. They see the failures of religious organizations over the centuries. People are still interested in ethics which is the practice of social mores, but they are interested in morality that is relevant for the lives we lead today and the problems we face today in our social groups, not the problems faced thousands of years ago by our ancestors.
This is not a bad thing. This is a natural evolution of society that comes with the information age.