> Immigrant children born in Canada are less likely to follow religion than not.

That is actually the wrong conclusion, so you inadvertently proved my point.

In fact, I don't understand your statement. Immigrant children are less likely to follow religion than not follow religion? ? ? ?

Here, if you decode all the graphics, the conclusion is that the 2nd generation children are less likely to follow religion than 1st generation children. That's what the graphics show with their labels, but I suspect that isn't what OP meant. Maybe it is that 1st generation of children born in canada of immigrant parents are less religion than their parents (the immigrants born abroad).