I’ll leave this discussion if you wish with this sutta. Thou if you wish to continue later, I’ll gladly come back. (Also as I believe in Bible, I do believe in undying, unborn spirit and in God as well - as beyond the scope of logic & language; but concept of self is clearly defined in language, and associated with aggregates)
MN22:
“But can there be anxiety about what doesn’t exist internally?”
“There can, mendicant,” said the Buddha. “It’s when someone has such a view: ‘The cosmos and the self are one and the same. After death I will be that, permanent, everlasting, eternal, imperishable, and will last forever and ever.’ They hear the Realized One or their disciple teaching Dhamma for the uprooting of all grounds, fixations, obsessions, insistences, and underlying tendencies regarding views; for the stilling of all activities, the letting go of all attachments, the ending of craving, fading away, cessation, extinguishment. They think, ‘Whoa, I’m going to be annihilated and destroyed! I won’t even exist any more!’ They sorrow and wail and lament, beating their breast and falling into confusion. That’s how there is anxiety about what doesn’t exist internally.”
Mendicants, were a self to exist, would there be the thought, ‘Belonging to my self’?”
“Yes, sir.”
“Were what belongs to a self to exist, would there be the thought, ‘My self’?”
“Yes, sir.”
“But since a self and what belongs to a self are not actually found, is not the following a totally foolish teaching: ‘The cosmos and the self are one and the same. After death I will be that, permanent, everlasting, eternal, imperishable, and will last forever and ever’?”
“How could it not, sir? It’s a totally foolish teaching.”