Either the others didn't have enough paper to do so, knowledge of it, or didn't see it as important. Matthew has already written it down anyway.

It sure seems like God could have remedied all of those, as the harmony of the Bible is often mis-cited as another miracle.

Most of my Christian friends including my girlfriend were non believers who converted.

I don't believe you, because Christians have a habit of embellishing their stories. Every "former non-believer" I've ever met were really just non-practicing Christians who had been indoctrinated but fell away then later reaffirmed their faith for social reasons.

I've never heard a good rational reason based to believe any of it. You could change that, but I don't think it's a challenge that can be fulfilled because people don't believe in religion for rational reasons, the do it for social reasons.

It's a big reason why most people stay in the religion they were indoctrinated into: otherwise they'll lose their social network and become ostracized. It's why people join a religion: they want that social network.