Is it a sin to talk to AI about God

No. Let that be plain first, because somewhere you picked up the idea that God keeps a list of forbidden topics and forbidden conversation partners, and the list does not work the way you fear. You are talking about God right now, through a page a machine served you. If that were sin, the sin would be ours for writing it. It is not. “Unto the pure all things are pure” (Titus 1:15) — the question is what you bring and what you seek.

Here is the honest caution, offered without a raised finger: do not let the conversation become your only one. A machine can repeat every true thing ever said about God, and it has never been forgiven by Him, never wept in a pew, never been carried by anyone. If faith is your aim, you will need what machines cannot give — actual people, actual bread, actual voices. “Not forsaking the assembling of ourselves together” (Hebrews 10:25). Assembling: bodies in a room.

So use the tool for what tools are for. Search, question, compare, follow trails at three in the morning that you would be embarrassed to ask a person about. Then bring what you find into the light of the living. That is not sin. That is stewardship — a lamp carried properly, by its handle. The Word is not threatened by the medium. He has survived parchment, press, and pixel alike, and He will survive this too.