Yes perhaps I should not have focused on immigrants when the overall question I want to ask is if this effect is driven by religious subgroups/subcultures which include both immigrants from religious countries as well as people from religious communities within the US.

My hypothesis is that we’re not seeing much of a “return to religious observance” from children of parents with low/no religiosity and that nearly all of the resurgence is driven by the aforementioned religious subgroups.