One of the differences between Christianity and all other religions is that we have no holy places on earth. A church building is just a building. We are the dwelling place of Christ, not any building.
It means we take care of our church buildings in the name of stewardship, but they are, ultimately, just a place to keep us out of the weather and give us some privacy as we worship and celebrate grace together.
You can’t offend Christians, spiritually, by destroying their buildings, though you can cost them money.
Church is not for God. It is for us. And we can worship anywhere. In fact, in my family, we take communion at home after some meals. The bible is very clear about communion.
If you reject the importance of communal worship, them skip the following.
A church is not something we worship IN. A church is something we worship WITH.
Of course, a church building is not the most important aspect of worship. The prayers of the soldier in the field and the child on his knees at bedtime, or of a family around the table are more precious to God than the most elaborate liturgy in the fanciest cathedral.
But if communal worship is important then it is important how we design the place we do that, how we decorate it, and how we comport ourselves in it. Every aspect of it should contribute to our worship of God. In that way it does indeed become a sacred place.
It does not take gold and silver appointments to make a church a sacred place, but it stands to reason that if we consider our weekly communal worship to be the most important, most significant event of our lives, then the building in which we do that should reflect that to the best of our ability, and we should also dress at least as well as we would to a job interview, and we should act as if worshiping together is a sacred act.
Unfortunately, not only have we become an undisciplined nation of slobs, but the sacred nature of worship has been mostly forgotten.