Is Satanism the Largest Religion? [I Am a Satanist]

According to some Christians, as a non-Chistian I must be in league with Satan. As there are only about 2.5 billion people on Earth who identify as Christian there are 4.5 billion people "in league with Satan". Not all of those who identify as Christian a practising. Some barely know what the word Christian even means, they just claim to be because it's the official religion of their country or their parents were (or claimed to be) Christians.

It looks like Satan has at least twice the following of God! I'm not taking any chances, Hail Satan!