To say this is to ignore the communal aspect of holiness, which is critical. A two legged stool cannot stand!
Without a community, we are aimless.
And it is within a religious system that we find that community.
Plusses and minuses are also found there, for sure, but there can be no holiness outside of community, and so religious practice/participation is indispensable.
Root Page: Spirituality
The Holiness Project 