That has happened to some dedicated Christians, and some of them were disfellowshipped because they were not repentant.
وَهٰذَا مَا حَدَثَ مَعَ مَسِيحِيِّينَ مُنْتَذِرِينَ ،‏ وَبَعْضُهُمْ فُصِلُوا عَنِ ٱلْجَمَاعَةِ لِأَنَّهُمْ لَمْ يُعْرِبُوا عَنِ ٱلتَّوْبَةِ .‏