Philosopy is science, it's rational deduction. Religion of course is abandonment of rationality. I think the reason to fear fanatacism, which is what religion is, is that most of the worlds suffering can be traced back to it. I'm in agreement with the constitutional authors when it comes to religion-"This would be the best of all possible worlds, if there were no religion in it!"
But I don't think anybody is seriously deluded enough to think that they can suppress or eradicate religion. Understanding the cause however is something I find fascinating. Don't confuse spirituality with religion, if that is even possible to confuse the two.
People in general seem to have a need for dogma and religion. Take for example buddhism, a worldview based on scientific principle which can be demonstrated and observed. It's since been corruped by mankind with idolatry and ceremony and dogma.
I don't think the budha meant that karma was a supernatural force. Or that our concious continues to another creature when we are reincarnated. For these things are not observable or demonstratable.
When I related to a friend what I thought the budha meant he replied jokingly. "Yeah but where's the fun in that". Perhaps that's part of the puzzle, people want to believe in the fantastic.
It seems that human beings have this unreasonable, intrinsic need for idol worship, ceremony, shamanism, and a belief in supernatural. This fascinates me, and any research into this field interests me very much.