“Nothing outside a person can defile them by going into them. Rather, it is what comes out of a person that defiles them” (Mark 7:15).
Jesus did not say every act is justified as long as the dead bodies that result from the act are eaten. Instead what he said is what comes out of a person is what defiles them. So ask yourself this: When it comes to how you treat God’s beloved animals (Psalm 147:9) that he has entrusted to humanity, do you exhibit “love, joy, peace, patience, kindness, goodness, faithfulness, and self-control” (Galatians 5:22-23)?
Or is what comes out of you instead: cruelty (Proverbs 12:10), indifference to the suffering of your animal neighbors (Luke 10:36-37), uncontrollable desire to consume flesh (Philippians 3:19), causing animals to be afraid (Habakkuk 2:17, Genesis 9:2), unconcern for the distress caused to others by your food choices (Romans 14:15), neglect of divinely ordained responsibility of earthly stewardship (Genesis 2:15), and tightening yokes rather than loosening them (Isaiah 58:6)?
Certainly what comes out of a person is what defiles a person. One must repent and do the first works (Revelation 2:5), the “very good” works that God instructed from the beginning (Genesis 2:15; 1:28;31). “Do everything in love,” including how you treat animals (1 Corinthians 16:14).