The problem is this belief is unScriptural and leads to a real misunderstanding of God's creation. But it is definitely the mantra of modern man.
The idea that God is actually "in all of us" is a gnostic, Platonic concept which permits man to think of himself in God-like terms and abilities apart from Christ. All sorts of mischief and error results from not understanding the difference between carnal man and spiritual man.
Only God saves. The ears with which we hear or ignore the Gospel were created and given by God, according to His plan for salvation from before the foundation of the world.
"What then? Israel hath not obtained that which he seeketh for; but the election hath obtained it, and the rest were blinded
(According as it is written, God hath given them the spirit of slumber, eyes that they should not see, and ears that they should not hear;) unto this day" -- Romans 11:7-8.
Jesus answered them, I told you, and ye believed not: the works that I do in my Father's name, they bear witness of me.But ye believe not, because ye are not of my sheep, as I said unto you.
My sheep hear my voice, and I know them, and they follow me:
And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand.
My Father, which gave them me, is greater than all; and no man is able to pluck them out of my Father's hand." -- John 10:25-29.
The Vedas say that God is in everyone's heart, and that's my authority. Just as the body cannot live without the soul, similarly, the soul cannot exist without God's presence.
I don't expect you or anyone else to accept on my say-so, but since it does say in the Bible that all are children of God, I think we could agree on the point that God is the Father of all.
Let us say that all souls have the potential and duty to become the good children of God, not the rebellious prodigal sons that we presently are.