Agnostic atheist here who was raised Episcopalian and was an altar boy for years in his youth.
Something people tend to miss about Christianity is that the whole point of Jesus was to sacrifice himself to absolve humans of the sins and laws described in the Old Testament.
So the adherence of many “fundamentalist” Christians too the laws set down in the Old Testament seems ridiculous to me. In my mind, they ignore the most fundamental teachings of Christ, and if you do that, why claim to be Christian at all?
(Sorry, in a weird place right now, otherwise I’d just be avoiding this topic entirely.)