It all depends on what you mean by "religion." The problem is, most religions claim that they are not a religion. If a religious person is one who focuses on man's relationship with the Divine, then Christianity is most certainly a religion.
If religion refers to religious practices and ceremonies, etc., then Christianity is not a religion per se, but rather, religion is a part of Christianity. Indeed, could one be fully Christian without religion? Obviously, the Protestant answer is no.
I understand how "religion" can also be a neurobiological illness that excludes a true and living faith. I think it just depends on what we mean by "religion."
In Koine Greek, btw, there's several words that could translate to "religion":
eusebia = piety, living in a "religious fashion"
threskia = religion in the sense of worship (James 1:26-27)
deisidaimonia = fear of the gods, used twice in Acts, once refering to the Athenians out of the mouth of Paul, once refering to the Jews out of the mouth of a Roman, but still never used in a negative sense.
So, religion is fundamentally a good thing, according to scripture.