Religion natural or necessary aspect of the human experience

Neither.

Hi Ella, for J H, as he says, it is neither.  People will have views that differ  in answering a question having to do with "religion."

For me, I would answer: Both.  Because I believe looking for, and living a "religious" life is both natural and necessary. 

 If we didn't seek to at least acknowledge a higher purpose, we would not be the "thinking" animal.  Humans need explanations of their spiritual lives, and to me that is natural and necessary, in order for us to grow....(not remain stagnant in our thoughts.)

Njoy is correct. I would only suggest that you read what King Solomon says in Ecclesiastes 3:11. That answers the question even better.

Ella -- Ecclesiastes 1:14 -- I have seen all the things that are done under the sun; all of them are meaningless, a chasing after the wind.

This though, by King Solomon expresses the emptiness of spirit, the numbness of the mind, the weariness of the body. A man who had it all and more, yet he found it all meaningless. 

Only God gives meaning to life, self and mind.  Because in the end, all is meaningless.  Religion I could do without, but I need God.  He gives meaning to why I exist, why I love, and yes, He gives meaning to this world we live in where sometimes things just do not make sense.

Both, one needs the security of the other for safety and support, "the  necessary".  The other, a way to feel part of a group, village, city etc. for "the natural".   Have a great day.