I've heard it said that science is about the how and religion about the why.<quoted text>
(Organized) Religion is how man answers what he perceives is a call from God.
Religion is man in search of God. Philosophy is man in search of truth. On some level these are the same, but only if everyone agrees what truth is. Which never happens.
But why search for god?
To give meaning and value to life. To explain our existence. To make sense out
of all of this. Religion sounds to me like a branch of philosophy. But doesn't matter much what you call it.
On a physiological level our deepest thoughts/emotions/feelings, even our so-called "spirituality" - are electrically charged chemical reactions. True.