As your question and details stand...
The answer is... No. Absolutely not justified. And you show every sign of being a victim, and a tool of Christianity. A troll, who is innocent and unrealizing. Attempting to bring attention (unjustified) to the Christian God, by pretending to wonder whether belief in the Christian God is justified.
This is not an accusation. I believe you innocent. Caught in the trap, unawares.
I may be wrong. Here is how you can improve your question and details...
- Explain the leap. Provide details of your "private" and "personal" experiences. (Which as Christians would want, you are now making public, non-private, non-personal).
Because. I might be wrong. Perhaps God, with beard and robes, in person, the Christian God, and say unto you, your personal self... "I AM GOD". Or in some other way name himself to you personally.
Otherwise...
Do you see the bait and switch that you pulled? You started of fuzzily...
- Can private experiences justify private belief in supernaturalism?
- Is it ever rational or justified to believe in supernaturalism on the basis of private experiences (of the kind for which publicly accesible evidence can hardly be produced)?
- If someone has private experiences that make supernaturalism self-evident to them (just like the physical is self-evident to everyone else), is it rational for that person to believe in supernaturalism?
But then, look who showed up, otherwise unnannounced, and uninvited... Good old grey-beard Himself with a capital G.

Not, I will point out, Posiedon, God of the Seas. Not Thor, God of Thunder.
Not my personal favourite...
Quetzalcoatl was an Aztec and Mayan creator god, who was also the patron of rain, science, agriculture, and much more. His name means Feathered Serpent in Nahuatl, the Aztec language, and he was depicted as a combination of the green quetzal bird and a serpent.

If you edit your details, and explain the mystery leap, that sure seems like "implantation and manipulated belief by suggestion" that you are a victim of. And now a pawn of some church wanting you to "spread the word"... and you don't even know it.
(It's ok, like the kid in 6th Sense says... "I see them everywhere... and they don't even know it".)
Again. I could be wrong... and my downvote could be turned upside down, like a frown... to an upvote, if you provide the details that explain the leap.
Otherwise... aren't you in violation of denying the existence of Quetzy, the True Creator God?
Who named "your" "personal private experience"? Did your experience name itself? Or did the Christians get to you? Implant. Steal your ability to think and reason on your own behalf and draw your own conclusions without their suggestions and their "help" with "your" thinking?
Currently... NOT JUSTIFIED. The flaw, is the leap to naming, that which seems extremely unlikely to have named itself.
The invitation to correct the flaw stands. One must be fair when dishing out justifications.