All true, but only half-way. Anyone can go into a church, but I can't imagine many Hindus, Sikhs, Muslims, or even (especially?) other Christian denominations frequented it, being a Catholic Church.

Additionally, comparing this to people visiting the pyramids isn't quite the same, because we only appreciate them for their size and construction. Their original meaning cannot be understood by us, because we have grown up in a world so incredibly different from theirs. Similarly, I can appreciate the work that went into the Taj Mahal, but I will never understand its significance in the same way that a modern Indian Muslim would, and certainly not in the same way that a subject of the Mughal empire would have.

The same is true of Bach's music too. Even modern Christians cannot really understand what Bach was getting at, because the world was such a different place when he was composing; he was a Lutheran from the 17th century. I still listen to his work and marvel at it, but in an incredibly different context. I cannot appreciate it as someone from the same time period would have.

This isn't to say that there's not something universally impressive about all of these things, but it is to say that not being a Catholic will significantly change your perception of this incident. Only when removed from its place of ritual can it really be admired on its own terms, equally and by everyone.

I hear what you're saying about the lack of public spaces though, and I agree with you in that regard.