Churches are not subject to taxation per the 1st amendment provision about free exercise. You can't take some of my worship and say it was free; it wasn't free, it was curtailed. And that by act of congress, if they ever get around to doing it.
The NRA is a great organization, nonetheless. I applaud your support of them. :>)
They don't have the protection in the 2nd amendment of specifically being mentioned, though, as the church does in the 1st amendment.
You are confusing free expression with tax free.
The 1st Amend applies to everyone and anyone equally. There is no distinction regarding org contained in it's clear English words.
Isn't Ken Ham facing jail time for claiming that he didn't have to pay any taxes because he was a church and all he had belonged to God?