I think the word religion is defined differently with different people thus, creates a conflict of interest. Well, let's imagine someone being inserted on a island or planet with no knowledge of how he or she got there in the first place, without doubt there woud be questions running in that person's head like, how did I get here? Or, what am I doing here? Or, how do I survive? The same can be said about God's existence, etc., etc. One can't know that God exist if one is not told because true knowledge is not self-gained. Someone has to tell you.
Since religion relates to a belief in some God in which one looks to for strength and guidance, those who has had a "face to face" relationship know God exist whereas the rest will have to take his or her word. And that is where the problem starts.
Thus, those who have no first hand experience will either believe in faith or simply use the mode of reasoning or deduction on what's around him or she. E.g. I don't see God in our midst therefore, He does not exist. Or, If God exist, why did He not save my child?
My understanding leads me to say, we are nothing but a spec of dust in the entire universe. We are not a flower plant that blossoms by the season. We are not on this planet by accident. Man will not find God the conventional way. We and everything around us are telestial (corruptible or prone to die), thus God does not dwell in such a place. In the present state of being, we will NOT withstand (even a second) if God suddenly appears.
So, having a religion that tells me there is a creator with a plan for mankind causes me to know why I am here and where I am going after this life. Because I cannot control the corruptness of the world, I have to learn to live in this world and not be of the world. That means, be tough but have tolerance and be patience toward others. Be a good citizen yet stand up against corruption.