What date do you estimate atheism will overtake theism in the world population

[Coveny]

For many years now I've felt like the world is losing its religion quite literally. Polls around the world show a trend of fewer and fewer theists. So much so that in some countries atheism is the majority. However on the global scale theism still dominates atheism. We do see the young are far less likely to be theists, and the numbers of atheists there lend support to my idea that theism is dying. So the question is this at what year do you think atheism will become the majority on the global stage?