The feeling of being part of there being greater is biologically built into us:
- we have a sympathetic system that mimics what others strongly feel (and is why women's periods can align, why peoples breathing can align, why mob mentality exits, why it's hard to be calm when someone is angry with you, and many other things). So our own body is readily influenced by those around us (and likely our surrounds).
We are biologically driven to form societies (something bigger than ourselves).
We have a subconscious that forms literal connections. This is how we learn. We can also program those connections through various means (repetitious training, focused meditation, focused prayer, affirmations, hypnosis etc). The degree of success of such programming depends on many factors.
So you are driven to believe in something bigger (society) and you want to explain the inexplicable and wonder if there is something bigger, and you bow down in focused, dedicated prayer...and in doing so, you are better able to access your subconscious, better able to access your feelings....and you feel within you...and your mind forms connections, reinforcing that feeling...which reinforces your belief, which reinforces...
Then you do this as a group, and your sympathetic system kicks in. And the more of you that do so, the stronger the reaction within your sympathetic system, the strong you feel, the greater your belief in that feeling...
My point is - be careful with your definition of God based on 'feeling'. If you pay attention to the world around you, you will see that peoples feelings are greatly influenced by their own desires, and their groups desires. You will see the (negative) affects of mob mentality, you will see how we are influenced, and more importantly, you will come to see how we influence our own selves, our own feelings.
I personally am ambivalent about the existence of God. Nice idea, not so much the religious theology that goes with it.
Were I to define him/her, I would first say the Universe, secondly the underlying force, thirdly the spirit of life, fourth the voice of diversification. Once could attribute love to such a God, but it would not be quite the love that we understand. It would be an impersonal love.
We are all capable of good within ourselves. We are all capable of greater love, greater kindness, greater empathy. We are all capable of lifting others up. We are all capable of greater understanding and acceptance of ourselves, and others. These do not require belief in a God, though such belief can be of help, for through belief in a higher power, you may let go of some of your more difficult emotions and upsets, thereby enabling one to find the greater empathy and compassion within yourself...but such belief it is not essential to this ability. There are other paths.
As a note: I am not against other definitions of God. Nor even against belief based on a feeling. I would only mention that faith does not exist where certainty exists.