You will always be a Catholic, even though an inactive one. The Baptismal mark and Confirmation mark on your soul do not go away. They are there forever.
What mark does Jesus bear, bestowed upon Him by John ?
I left Catholicism in part because of the arrogance that I saw rotting the souls of Catholics, and I didn't want it to happen to me. I saw Catholics speaking like you do, about "marks on souls" like slave brands, and using domination terminology to deny the free will of the soul before God and "claim" it for the Church.
I was, and still am, sickened by these ice cold power plays in the name of divine love. I would cut out any part of my soul that would link me to people who would arrogate to themselves the right and power to decide other's relationship to God. What staggering hubris!
Millions of people reject your meddling and clawing dominance claims and dark threats of authentication authority with the righteous rage of souls who know they are already beloved by God. But still you remain utterly clueless to the wreckage you create around you, calling your judgements "love," and castigating those who flee your grasp.
Get thee behind me.