We don't "need" it. But it might represent objective truth -- maybe not all in one neat package, maybe not any one religion alone.

The "need" is to understand our world without dismissing what we don't understand. Some would like to believe that religion is the avoidance of facing what we don't understand. That may be so. It certainly would appera that way in some cases.

But it might also be that dismissing all religion on the basis of either one religion's weakness to address mysteries that matter to one, or on the basis that one religion is the same as any other, is faulty logic.

It's like looking at asprin's ineffectiveness on cancer and concluding, "why do we need medicine?"