I'm not and never have been the least bit religious, but I do try to be considerate towards those who are. I love going in old churches and cathedrals, eg, but I do feel I'm kind of there on sufferance, and certainly wouldn't dream of allowing my kids to run around or even raise voices. I also think it's a bit too glib and easy to just write off religions as having been responsible for vicious wars and terrorism and pedophilia and all the ills that ail us - as tho' that was the whole story.
For many people, their religion does provide/accommodate a very human comfort and companionship, and does no-one else any great harm. My in-laws are typical woolly CofE types: aimiable, friendly to a t, and always up for a charity cake bake or a harvest festival. In their own undemonstrative way, they're a force for good rather than otherwise. I've also always remembered Don McCullin (I think it was) saying that wherever he'd been - and he'd been to the middle of the very worst events of his time - you could always rely on finding - and he was quite specific about this - Roman Catholic priests and nuns putting themselves through real hardship and at great personal risk to bring help to people who needed it. If you ever found a clinic in the arse-end of the world or someone bringing water to a freedom-fighter under fire, you could be sure it would be a priest or a nun who was responsible. It's true that the fascists and Nazis found some pretty dubious backing from the RCs of the '30s, but by the '60s and '70s, when the ordinary people of Latin America were battling vicious CIA-backed oligarchs, the footsoldiers of the RC church were very much - and very actively - on the side of the angels.
Having said all that, I have as little tolerance as anyone else hereabouts for those who insist that their truth is The Truth, and seek to impose it on others. They, for my money, can spin on this.