It's not so rare. You see people who are "devout" in terms of all sorts of religious practices, then they surprise you by being so utterly lacking in common decency, humility, and compassion.
What that means is that you can have all the external practices and more, with all of the rigor of the most rigorous, and, when all is said and done, not be the real thing.
In fact, all the external practices may be just what they need for reasons that have nothing to do with genuine conversion, with compassion, or with imitating Jesus. There is no security for them or for us in the externals. Don't rely to your detriment on the externals.
The real thing is always distinguished by humility and compassion. Even the hint of self-righteousness is a big, big red flag of danger and a warning to stay away.
(Image of Good Samaritan by Morot in public domain)