To sum up, the One True Faith is the ultimate destination religion.
Once there, either from birth or by means of sincere sacramental conversion, it’s as if you are a Natural Born Citizen of the Kingdom of Heaven. Nobody can externally “dis-seize” you of that status but your foolish or heretical actions, taken deliberately according to your own free adult will, specifically amounting to apostasy, or objectively producing schism. By then it would be sugar coating things to refer to you as “not being in full communion” with Holy Mother Church. Your her enemy!
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