According to those who judge by outward appearances of "piety", maybe.
Evidence of humility is teachability (like a little child). He may be humble - time will tell. Right now he shows evidence of being still quite spiritually immature.
The spiritually immature give themselves away by being guite legalistic (because the young still need guard rails), and at the same time, arrogantly assume that they're grown up enough to teach others what they should "do" to be "right with God".
I am afraid you just don't like the fact that his religion disagrees with yours.
Would you want him to go against his conscience any more than you would yours?
You do not know the man, so reserve your judgment.