J. Vernon McGee made me Catholic. In my opinion one of the greatest theologians of the 20th Century. I have his entire series on the Bible. I was also “saved” and “born again” when I was a baptist. But I did not have the fullness of the Christian faith, I do now, thanks to Church that Christ started, introduced to me by Dr. J. Vernon McGee.
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The “fullness of the faith” is always Christ.
Things added over thousands of years - including paganism - is a pollution of Christ’s sacrifice. It can never save.
And of course, maybe you thought you were saved, but never came to faith...