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Furthermore, you are in no position to claim what type of people the church will accept and what it will not in regards to your assertion that "there is no tolerance to accept an atheist who refuses to change. Period."
I came back to my community without being repentant, that should tell you that some people may just want to reconcile with their heritage, or that perhaps some people may just want to learn more about where they come from, not that they are necessarily repentant.
The only time I've seen a priest (a monk-priest to be specific) not allow someone to take communion was when the girls had lipstick on their mouths. That priest was then returned to the monastery by the bishop and has not been permitted to pray any liturgies.
No priest would stand there giving out the Body and Blood after making them go through an inquisition: they won't stand there and ask every person in queue if they've ever lied, fornicated, killed, swore, etc. and repented of it before they give them communion.
Back to St. Augustine: he used to enjoy fornicating with women. He would even pray to God saying: "Grant me chastity," but then he would add, "but not yet." Do you think that as an unrepentant fornicator, this saint should've been forbidden from the sacraments? Clearly that wasn't the case in the past, and clearly that's why he's responded very well concerning this subject against the Donatists.
Energy can be neither created nor destroyed. It can only change forms