Will atheism take over

Answer 1

Somehow, I doubt it. Religion is far too well established for Atheism to become the norm. Depending on the stats you use, atheists either make up a tiny percentage of the world's population (if you only count people who are openly atheist), or they are a significant minority (if you include people who don't actually believe in a god or gods but pretend they do because they're afraid of being different or whatever). Either way, the number of people who would be willing to stage an 'atheist revolution' is pretty small. Anyway, one of the main issues that many atheists have with religion is proselytising, or attempting to convert others to your faith, so they're unlikely to want to do so themselves (unless they're militant atheists, who are a minority even among atheists). To summarise, there are not enough atheists to 'take over', and the nature of atheism makes it unlikely that this number will grow significantly enough for an atheist takeover in the near future.

Likely, no, it will not completely. Even of majority were to be atheists, it would never be 100% of the world, much like belief in the Divine isn't one hundred percent.