What determines 'growth'? Ask yourself, do they look at all the numbers, including those leaving, either via fade, da/df, or death or is this growth number strictly being counted as people joining up?
What makes this growth possible despite all the exposure on the internet and other media?
Much of this 'growth' is happening where people do not have access to the Internet and other media. Wait until they find out they've been lied to.
Is this not a sign that perhaps this is the true religion?
No. Numbers can be made to look any way you want them to. They are not a sign of 'truth'.