Pre-Vatican II the Catholic Church made it very clear that Catholicism is the only true religion and the only true Church. So, yes, anything that is not Catholic is false. This was (and is) the Traditional Catholic position.
And what’s with the *crickets* comment? You posted late at night. I went to bed.
Thank you for your honesty. To sum up---in your view, a person can accept Jesus Christ, be baptized in the name of the Father, Son, and Holy Spirit, and live his or her life for the Lord, but if the person isn't walking through the doors of a Catholic church on Sunday, he/she is a heretic practicing a false religion.
Understood.