The whole purpose of the thread was not intended to be a discussion of whether God exists or not. There have been many of those, and I really didn't want to re-hash that.
The purpose was to delve deeper into the superficial answer that is often given that either God lives in heaven, or God lives in the heart, or both.
If God lives in the heart, do you mean the mind, or brain, and if so, where exactly? Is there a special place in the brain, or is it in the neurons and connections, and if you could remove them one by one, does God disappear. If a person gets Alzheimer's, and doesn't know who God is, is he gone? When you say God lives in your heart, do you mean he is a disembodied entity that just floats around in your body? If you say he communicates with you, are you hearing an actual voice, or is it the same as your thoughts? Thoughts are constructed from neuronal connections.
If you say God lives within your mind as a spirit, do you mean your life energy, and if so, how is your life energy different from that same life energy in a non-believer? Do you believe everyone has a spirit, and inviting God in somehow alters that life energy? If everyone has a spirit, did it arrive at birth and does it go somewhere else at death? Is God independent of the life energy in your body, and you now have an additional energy entity living in your body?
If you say God lives in heaven, where is that? Is it in another dimension undetectable by telescopes? Is he in an energy form? Is it the same energy that science has been able to detect in space, or something different?
Sorry to ask all the questions, but I find canned answers meaningless. If you don't know how or where God exists, just say you don't know, and that's that. But, if you claim to know God lives in the heart (Mind), or in heaven, then we can explore the specifics.