Let me rephrase since you missed my point (my fault). If there were 2 billion Christians of the same character as the first 12, there would be nothing else in the world but Christians.
So much for the narrow gate and all that.
So much for a glorious victorious king returning and defeating Satan and binding him. Given a few more years, heck even months, christians will convert the entire world, and bind Satan ourselves, and have him wrapped nice and tidy for when Christ returns.