I’m certainly not going to say you’re wrong. But whereas how circumcision establishes a distinct people, I’m not sure how the prohibition of eating cloven-hoofed animals does that. You’re general point is correct: Christians aren’t bound by the Mosaic dietary code. A lot of the sexuality code seems really weird when you make it about setting apart a chosen people, but makes sense when you get into epidemiology of STDs.
Actually, no one is bound by the Mosaic dietary code, because the ancient nation to whom it was given no longer exists. They ceased to be binding at the appearance of the One to whom all these laws pointed, Jesus Christ. Christ set aside the temporary aspects of the Mosaic (e.g., Levitical) code once for all time, since they had served their purpose in identifying the Messiah of the new covenant (cf. Hebrews 8:13). The Levitical priesthood (and all rites and practices associated with it) has been set aside in favor of the greater High Priest after the order of Melchizedek.
But whereas how circumcision establishes a distinct people, I’m not sure how the prohibition of eating cloven-hoofed animals does that.
Partly by enforcing a division in their minds: "We don't eat what those other people eat." It would also keep a scrupulous Israelite out of pagan religious feasts.