This site seems to be much more into deleting comments than other SE sites. Is that the case or is it my imagination?
I'm looking for a factual answer if possible, please.
There are most definitely sites with fewer comments deleted, but every specific site has its own issues and problems that make comparing any two sites a pointless exercise: given any site on the network, there are bound to be several metrics outside the norm for the rest of the network.
Christianity doesn't have the same problems as SciFi or Meta Stack Overflow, and its numbers, whether it's for comment deletions or closure rates or number of people named Bob, are going to be materially different from those two sites (as well as every other site on the network).
All moderation across the network is peer-reviewed as well as reviewed by SE, Inc.: if there was a problem or if Christianity was doing outside the bounds of normal moderation, it would be addressed and corrected. While moderator agreements prohibit moderators from sharing specific data without permission, Christianity's numbers were compared to other sites like Programmers (where I am a moderator) and Gardening (where wax eagle is a moderator) and found to be pretty comparable.
Yes, we delete a lot of comments.
We also generate reams more comments than most SE sites do and spawn more chat rooms from excessive comment threads than any other site per capita.
That being said, your noticing this here is probably indicative of your own investment in the subject matter rather than an anomaly in moderator practices here. You will find similar discussions about deleted comments on other metas, particularly on sites that deal with less technical subjects.
Comments are intended to be transient. They are not permanent and should not be considered as such.
Moderators delete comments for a variety of reasons, here a just a few.
Some things to keep in mind.
Anyways, our comment deletion is not something out of the ordinary for SE sites, and its for a purpose, we are trying to keep things clean here and make this a useful site, not just for our regular users, but for our primary audience, search engine visitors.