Actually, if you count people as Christians by simply them choosing to consider themselves Christians, then there are about two billion Christians: 1.1 billion Catholics, 300 million Orthodox, 70 million Anglicans, 400 million Protestants (or Nondenominationalists, and including Baptists, etc.), about 100 million quasi-Christians (Mormons, Jehovah’s witnesses, Christian New Religionists, etc.) and 100 million crypto-Christians.
There are about 100 million Muslims, including those of Muslim homelands who may not necessarily embrace Muslims.
I meant a billion muslims, not 100 million