There are many reasons why people believe Jesus existed, the biggest one is faith. Faith does not take into account facts. To this day there has been no hard evidence found that Jesus Christ even exisited.

There's no evidence that Nazareth even existed at the time that people claim Jesus did. There are 133 different years that people have claimed he was born and every month of the year has been claimed to be the month he was born at one time or another.

The Gospel of Mark, The Gospel of Luke, The Gospel of John and The Gospel of Matthew are the first writings that were ever discovered (in the Bible) about Jesus and they were written at least 70 years after Jesus was said to have died.

If you want to consider that evidence you can, but science and history won't.

Any proof he was crucifed ?