Jesus is presumed real. The problem is that people often do not change their minds even after sufficient proof is offered. Josephus may have had sufficient proof that Jesus is God, but may not have converted anyway. How many people know smoking is bad, and even know that it will kill them, but continue to smoke anyway. Jesus was heard talking to a man named Thomas. Thomas knew for a fact that Jesus was God and proclaimed that he must be the most blessed person alive. Jesus corrected him saying that he only believed because he saw.
Clarification:
The Christian concept of 'messiah' does not exist in Judaism. The Hebrew word 'moshiach' literally means 'anointed' and was the title given to any person who was anointed with oil as part of their induction into serving HaShem (G-d).
Flavius Josephus never converted to Christianity. He was not a contemporary of Jesus and could only have written based on second- or third-hand information. Moreover, the reference, called the "Testamonium Flavinium" is inconclusive, as well as being a disputed passage. It was long regarded as entirely a late Christian addition to his Antiquities, but there is some evidence that the original may have been written by Josephus, and then amended by later Christians to accord with their views.
The Testamonium Flavinium can not be regarded as evidence that he believed Jesus to be the Messiah. At most, it shows that he knew Christians of his time to be followers of Jesus.
Islam believes Jesus Christ was only a prophet, not the Messiah. So the answer is: Christianity, which teaches that Jesus Christ is the Messiah, and is coming back, the hope of all Christians.Another Answer:Both do but only Christianity believes Jesus will return as the King of kings. Some branches of Islam teach that Jesus will return to earth not as King or Lord of lords as the Bible teaches, but rather to accompany their 'mahdi' - the Islamic messiah, and to convert the world, including Christianity, to Islam by force.
Trying to convert them into Christianity
Jesus is the Christ, Messiah, God in human form, so yes, everyone who of their own free will, accepts Jesus Christ and who becomes a Christian is doing the right thing.
to convert many people to Christianity
Vladimir I ordered his subjects to convert to Orthodox Christianity.
Yes - Christianity, like many religions is evangelistic in that it believes in sharing its beliefs with others and inviting them to become Christians. According to Christianity it does make a difference what you believe, and in the final analysis the Christian religion is actually true and the other religions, while admirable in many ways, are not.
Christianity.
Absolutely not.
No.
Constantine
In the summer of 386 Augustine converted to Christianity.
Paul, or Saint Paul, or the "Apostle of the Gentiles", was a Jewish convert to the teachings of Jesus. Through his travels and writings, he was one of the main disseminaters of Christianity. He is the early church teacher who is credited with opening up the teachings of Jesus to non-Jews, thus making Jesus a Savior to all men instead of strictly a Jewish Messiah.