In Matt 7:21-23, Jesus is addressing believers who prophesied, cast out demons and performed miracles in his name. In order to perform those supernatural feats, those believers must have been in Christ – in other words, “born again”. Yet those same believers became doers of “lawlessness” (v.23) and Jesus consequently disowned them. This passage would appear to contradict your claim that once you are “born again”, you obtain an irrevocable, irreversible ticket to Heaven.