It is necessary to distinguish between dogmas that have been solemnly and formally defined by the Church, and actions taken by someone here or someone there who happened to be Catholic.
The notion of “once-saved-always-saved” has to be among the top five moronic beliefs concocted in the last 200 years. It flies in the face of reason, and it is not taught anywhere in Scripture. Intellectually and morally, it is a low point in the history of the maimed, deformed, crackpot versions of Christianity that have been loosed on the world by Satan since the Reformation.
If catholics really believe you can lose your salvation, then every catholic should be camping out at the door of their priest and constantly confessing sins. Every single waking minute of the day, month and year. 7/24/365
The fear the catholic must live in not knowing if they are "in a right relationship with God" at death must be paralyzing.
Amazing that catholicism ignores Ephesians 1 where the Bible notes that "you were sealed in Him with the Holy Spirit of promise, who is given to us as a pledge of our inheritance with a view to the redemption of God's own possession to the praise of His glory." I cannot find anywhere in the Bible where we are ever unsealed; either by Him or our own efforts.