Would this story be sinful, possibly blasphemous even?

I'm writing a story based off a video game, just for myself, wasn't going to share with anyone. Basically this Christian guy visits this place where a major character who's supposed to be a goddess resides. Learning of her, he has a kind of faith crisis learning her role is for real...yet, a close friend of this goddess(and protagonist of the game this is kind of a fanfic of sorts of) proposes both of their faiths can coexist. The Christian then asks a bunch of questions, related to his view of who and what God is compared to her idea, that deeply trouble even the goddess.

One thing leads to another over the next week and this "goddess"(who actually is one in canon, with this story taking a kind of AU approach) more or less accepts that she's probably a kind of "cosmic manager" of some kind, along with her fellow gods, for the true God rather than actual deities like she believed(like how kings are used by God even if they don't believe in Him).

I even had a scene where she is fully convinced she was originally created by God and converts, proceeding to announce to the city of her followers that she was decieved about herself, renouncing claims of divinity.

I've been thinking, could this story be blasphemous and I didn't realize? I mean Marvel explored a similar concept in a Thor comic once, and that's what inspired this. I thought it could work out if I leaned a bit more into the "Christian God is true after all" idea(Thor in that story, for reference, only comes to acknowledge there may indeed be a god above the ones of Asgard in response to a priest's faith crisis over him). I thought the idea was fascinating and wanted to explore that. Am I just doubting for no reason or is this worry onto something? Is this "personal conviction" territory or "Blaspheming the Lord" territory(I really hope it's not the latter)?