Where did "For Thine" go?

Sometimes it feels like when you’re a convert to the Catholic Faith, you are bilingual.
“Don’t Catholics pray ‘The Lord’s Prayer?’”
“Yes, but we call it the ‘Our Father.‘”

When this mix of Catholics & Protestants pray, there’s often a tension in the air when they get to that part - the one about “For Thine is the Kingdom…”

Thanks for praying with me,
Julie