I’d say yes and no.
Fewer people in USA nowadays are inclined to belong to a particular church or practice a particular religion. This is because society no longer expects everybody to belong to a church, to attend weekly church services etc. There used to be a social expectation that people would do this, and a person who did not belong to any church or practice any faith was negatively regarded. That’s all gone away.
However, the people who do choose to belong to a church and practice a faith tend to be stronger in their faith because they’re choosing to go to church, practice a religion, and generally put in the time to be religious, not just going because society expects it or because “we’ve always gone” or whatever. In fact, nowadays society might look down on you for going to church, so you have to be really committed to go in spite of getting snarky remarks from your peers or getting made fun of by some atheist late night talk show host. So, fewer in numbers, stronger in their beliefs.