I don't think that this fact some how dismisses the likelihood that many people throughout history merely pretended to be Christian simply to avoid being burned at the stake.
That's what organized religions did/do to non-believers. They burned them at the stake. Or stoned them to death, Or drowned them, or exiled them.
If your goal is to make contributions to society, in that context you're damn well going to say whatever you need to say about your personal beliefs to ensure that kind of shit doesn't happen to you. Hell, even if you don't care about making contributions to society you're still gonna say what ever needs to be said to ensure you don't end up burned at the stake.
The end result of all these theistic threats is that a lot of people who made great contributions to society did so under the auspices of religious organizations not because they genuinely believed in the tenants of those organizations, but because they had to.
And those organizations made those threats, and continue to make those threats because they know that this is the outcome -- that people will do things in their name to avoid the shit that the religion can do to them.
It's a racket, much akin to the mob coming up to a shop keep and telling them that it would be a shame if something were to happen to their business if it didn't have some kind of 'protection' that the mob can offer them.
It's no coincidence that the Catholic church and the mob originate from the same part of the world.