The ancient Greeks invented it.
They got everybody in town together, sat them down, (yes, plied them with alcohol) and told stories. The people listened, their hearts rising and falling with the joys and sorrows of the hero's. And in that act, in the act of empathizing, the people believed they were able (only in this sacred place, and only together) to communicate with God. By attending, by listening, and by communally giving their response back to the Gods, they were experiencing a great mystery.
This place was not a church or a temple. It was a theater.
My church is the theater.
If you do not believe that a theater is a church, that's fine. But those who do ask that you respect it as such. For, to me, to us, it is a sacred space.
Would you go into another man's church, and stand up in the middle of a sermon, and heckle a priest? Would you? Even if they believed all sorts of odd things you'd never even heard of; I mean, WOULD YOU?
I have been to friend's churches and temples and synagogues. I do not always believe everything I hear or see, in these places. But I don't heckle. I certainly don't snicker, or cross my arms over my chest shaking my head in disbelief. I listen, and I am respectful, and (while I'm there, I might as well) see if I can find a message inside that speaks to me. I mainly do this, though, not for myself, but for others. Yes, for those believers around me... because they are there to experience the Divine, in their own way, in whatever form that takes for them. I don't want to trample all over that; for that is sacred, too. Worship, in any form, is sacred.
Plus it's just rude, and bad manners, to disrespect someone in their place of worship. It's ... well, even the most common men and women understand that; don't they?
The theater is my church. It is my temple. It is where I worship the great Mystery. It is not a talk show, or a sitcom; the theater is a place for the communication of empathy, and a place for communication with the great beyond.
So if you can't at least be respectful whilst inside my church... you shouldn't be allowed inside it.
Which is why, if while inside you disrespect this place, this temple, this church, of mine... you will promptly be shown the door.