They may have or may not have. You are basing that assumption on writing by people who never met Jesus and were living in a completely different country when it was written.
And, there's many inconsistencies between the writings that are CLAIMED to be from people very close to Jesus.
You want to believe something and consistently ignore anything that opposes what you want to believe.
You claimed all the earliest Christian writings were from 40 to 90 years after the crucifixion. That's where you were mistaken. That would be two to three generations after the original apostles.
The earliest Christian writing we have corroborating the life, death, and resurrection is from only a few years after the crucifixion and was written by someone who had interviewed Peter, James, and John. That's the older creeds Paul quotes in Corinthians.
Most of the rest of the canon were compiled during the generation of the apostles.
Your claim that the canon was written two or three generations later by random obscure liars who were at least ten steps removed from Jesus' ministry isn't supported by a shred of evidence and doesn't even make sense in the contest of the manuscript evidence we have.
I expect witness accounts to agree, I expect them to diverge sometimes.
That's how witness testimony works
I would actually be highly suspicious if all the canonical gospel accounts lined up perfectly.
I agree with Bart Ehrman to at least 80 percent of the time. Me and Bart agree on the historicity of these events:
A Jewish rabbi from Galilee named Jesus lived in the first century.
He had a ministry and a group of followers.
He was arrested by the Sanhedrin and executed by the Romans for political crimes.
His followers genuinely believed they saw him again after the crucifixion.