The Bible is more of a historical record than a scientific textbook. Around the same time of Jesus, Mt Vesuvius erupted destroying Pompeii. An event that was likely witnessed by tens of thousands of people and killed many wealthy romans. Yet we only have one historical record of it from it’s time. The rest of the records are archaeological. Historical figures accept the birthplace of Julius Caesar as Suburra, Italy, without question, despite there only being a single source written 175 years written after the fact. The earliest source we have to Alexander the great was written around 300 years after his death, yet people accept that without question. Heck, going back to birthplaces, we even have three accounts within 90 years of Jesus existence and archaeological evidence of very early first century pilgrimages to show that Jesus was born in Bethlehem. Yet people dispute that, and you claim that “We don’t even know if Jesus even existed”
It seems your main problem is that personally, you think that God is “mean”, so therefore you try and convince yourself that He doesn’t exist, even if it means applying an unfair standard to the historicity of Jesus.
Many Evangelical circles don’t teach you crap, they deliberately empty the faith to it’s barebones. Some of them are very toxic and really just care about politics. Knowing just the Bible and nothing else without knowing how it came about and early church history, historical context, etc, can leave someone lost. But like how the father forgave his prodigal son and partied, you can always come back to God.
So I would recommend dropping the intellectually-dishonest standards and coming back to Him.