Between religious spiritualism and secular spiritualism is that religion always points to a creator and a PLAN.
If there's a plan, then stuff is not just happening randomly and aimlessly but going from point A to point B.
That's the most difficult barrier to dismiss because religious believers have spent their lives, trying to make this plan work ...... or at least, trying to fit in with the plan.
A plan ALSO ....... denotes progress. So believers feel they must progress their entire lives, into something they are not presently. Thus, they're always left inadequate because they can't achieve their goal of perfection because if they did, they would be stagnant. Until the day they die, they are continually "seeking the Lord's will" and "growing".
When you take THAT away, there may not be much ambition left to get stuff done because if God doesn't care (or isn't there) ......... what's the point of knocking yourself out to get something done to please him?