In the 1930s it was predicted that Atheism was the route we were on, and those in the scientific and medical fields would be leading the way. They even started tabulating numbers to keep track. But it turned out some years ago that despite such expectations, the increase in Atheism among those groups wasn't anything significant.
Interesting thing about those that don't actively practice religion, their children don't always stay away. Quite a few seek out religion, maybe go find another type. In fact there seems to be some sort of natural instinct that makes people inclined to be religious in some manner or another. Probably genes conferring such a drive as the more religious people are, the more altruistic and cooperative they tend to be, particularly with each other. This in turn gives them a higher survival rate, and thus the trait gets passed on,,,
Islam isn't growing solely due to population growth, but by conversion as well. In the UK, for example, while not in massive numbers - yet - it has managed to attract quite a few converts of British stock. The more common pattern is of young women from broken single parent homes. Evidently Islam, with its more rigid rules and strict male-dominated hierarchy, supplies to them the foundation and fatherly discipline they missed out on growing up. A decade or so ago, the numbers were in the (four digit) 1000s, but nevertheless they're increasing.
We see the same thing in US prisons, with young men, especially minorities (likewise from broken single parent homes) converting to Islam.
On the surface it doesn't seem so bad, offering people who feel lost some sort of grounding, a moral code, keep them away from criminality and further personal dysfunction.
But then when you look at Sharia Law and some of the harsh punishments that go with it as well as other customs the religion is notorious for, well, just take a look at their societies and compare them to ours. Stoned to death for adultery, gang rape by the village men as a form of discipline and punishment, getting thrown off of building for the crime of being the younger male molested by an older man while the perpetrator gets away with a couple of lashings and a good scolding, honor killings visited on daughters - usually....
Be careful what you wish for, because it is here.
And it is far worse than being forced to go to Mass on Sundays as a child.