WC - it's largely emotional. "My granny was married here, and it's been here since 1000 AD, and I don't think those [pick your own pejorative adjectives and nouns] at the airport have any right to knock it down." I've found sometimes that opposition to "development" in the Church comes from those outside who want it to "be there" even if they never come. Sometimes they oppose actions the Church congregation itself is totally in agreement about.
Demolishing the Church as an institution - feel free. But what do you plan to put into its place to mark the rites of passage, and to provide pastoral and spiritual care to those of a less robust confidence than yourself?
And what might God think of that? (I know you don't believe in him, but he assures me he believes in you.)