How is it "quite certain"? There is no evidence to give your statement certainty!
It's certain the authors believed what they wrote to be true because, as I said, they were persecuted for continuing to preach. This would have caused them to give up if they were lying or had made it up.
Rubbish! There are no firsthand accounts of anything that is claimed for Christ that were written at the time and the human memory is fallible engendering all kinds of incorrect memories = mistakes.
Matthew was an eye-witness. John, the beloved disciple, wrote the fourth gospel (by dictating to a secretary) and three letters.
Paul describes Christ appearing to him in 1 Cor 15:
"Then he appeared to James, then to all the apostles, 8and last of all he appeared to me also, as to one abnormally born."
Mark probably was the young man in Mk 14:51
Luke was not an eyewitness. But he traveled with Paul (see Acts) to whom Jesus had appeared. This would have been hearsay even to readers in the first century if they didn't have statements from Paul's letters that confirm what he taught Luke.
Again this comment is rubbish as there are NO first hand reports that were written at the time.
See above.
Believing the gospels are true is the result of your childhood brainwashing and a serious sign of a dangerously closed mind!
No, I didn't get confirmed with the youth group but later when I was sure it was what I believed.