As a , ahem, "historian" you are doubtless aware that EVERY  pre conciliar Catechism {and maybe even the JP II version} teaches as follows: QUESTION "Why did God make us?" ANSWER "To KNOW Him, love, Him, and serve Him so that we me obtain eternal happiness with Him in Heaven"{on the other hand, insofar as modernists don't typically read formal catechisms, perhaps I expect too much in assuming you do know this}. Your utter nonsense that truth or dogma changes has been condemned more times than I can count. God the Holy Ghost wills that all men--including schismatic protestants-- abandon their false cults and become members of the Catholic Church, outside of which there is no salvation.