Rofl is this question serious?
Isn't freedom what we are trying to work towards? Banning religion, whatever good it may do, has a whole bounty of negative outcomes that will tear up the minds of many who follow it. Look at Arab culture, Hindu culture, Euro culture, African culture, Chinese culture, damn, look at every culture. Religion has had some sort of stable formation value in regulation and reformation... Oh and comrades, Soviet Russia had it's own dirty little secret, the Russian Orthodox Church was still a major religion followed even in the 20th century. They may have tried to suppress religion, but they failed. The only way to sucessfully suppress religion is to have a one-world government/country with enough power to enforce the law... And I don't see anyone willing to shape into the Systems Alliance to do so, and even then there will be hold outs, and there's also the negatives in even making an attempt to ban religion. Do you know how many people are so clutched onto their religion that they will kill to defend it? More than 2 Billion, and that's out of 6 billion people on this world... Guess what, most of those 2 billion people willing to protect their rights to religion have guns... That's three bullets is all they need if each of them are a good shot.
Scratch rights for some, some are just batcrap crazy!
Making religion illegal would be a serious flaw and any government that would take the time to enforce it would find that there are bountiful flaws in the idea... Hate to play into effect "Goodwin's Law" here, but, 20th century 3rd Reich leader Hitler tried to suppress a religion and culture, along with several other cultures, and as we know that was a disaster.
If we want to get anywhere, we should make all religions Legal everywhere. That would be a hell of a lot easier to enforce, and so much more likely on many different levels.