Originally Posted by
Koolish
because Jesus, according to Christianity, is God himself. in Christianity, heaven exists. in Christianity, the world will end.
he traveled around because if he really was God, and if people actually did need to know this to enter into heaven which really existed, the only way to let them know was to go around and spread the news. if you sit in one spot and teach a few people your words will be lost in time. Jesus didn't write so his words wouldn't survive, after mucking around a lot people remembered his words and they eventually decided to write 'em down. the concept of the Messiah is rooted in Judaism and Jesus was fulfilling what was said to be the Messiah's duties. certain Jewish sects who do not believe Jesus as the messiah believe others to be the Messiah.
and in Judeo-Christian teachings there is only ONE God. therefore, there is only one right answer. Jesus was trying to give everyone the answer. in Christianity the hypothesis that other religions will lead to heaven is an unacceptable one, that is why Jesus was telling people that there is only one way to get to God. and you know what, you seem to be heavily focusing on what is written in the Gospel of John. 3/4 Gospels do not cite Jesus claiming everything he did in the Gospel of John.
the consequences of strictly Jesus' message have been beneficial to those who adhere to them correctly (think of Mother Theresa). the world, however, has felt the blow of power hungry men who have learned to control the undereducated.