That might be the most important message I'd like any theists lurking on this board to contemplate. I think most of us atheists don't mind much if people believe and worship a Magic Book if they want. We just object to the ability of cruel deviants such as the Pope and his cronies forcing their warped and twisted will upon the rest of the world. And if governments stopped giving religions special tax breaks and subsidies, it would be a little harder for the men in pointy hats to leverage so much power.
For me, specifically, it is about discrimation and reason.
As long as there's a legal definition for a religion, there's going to be discrimation because silly belief X qualifies as okay, but not silly belief Z. Why should X get the housing deduction, lowered utilities, no property tax, the ability to not have to charge sales tax, but not Z? Because X is a wider held delusion. X gets privledges that only are acceptable because somehow X is special and no one can come up with a logical reason why X is special.
That's where reason comes in, as long as X is given a special legal status, you are basically admitting "we care fuck all about what actually makes sense."
You see a theater troop serves the community, and they can get 501C3 status. They don't pay income taxes. Nothing is stopping them from existing. However, if you were to say "I can't work on Fridays because my theater troop thinks it is wrong;" an employer doesn't have to legally comply with that. If you were to say "Hey, my theater troop doesn't tolerate people making fun of how bad they are, I wan't a law passed to make it illegal to criticize it" you would be laughed at by legislators. If you state "Because of my Theater troops beliefs, I want this dropped from the cirriculum" it wouldn't even be considered. If you whipped your children raw, what your theater troop stated about how it would make them better actors wouldn't be an issue in a court.
I, and many here, have no desire to outlaw theater troops or religion for that matter. Just that your beliefs don't get anything different or special legally speaking because of the sheild the word 'religion' gives them.