What does the Quran say about Jesus / Isa?

please, I want to know. I want to know about JESUS in the Quran. Who is he in the Quran & why do the muslims don't believe in Jesus? I don't get it that they believe that he is alive when they believe Muhammad is dead? Jesus never had any wife. Muhammad had 9 wives. And someone please explain to me, WHY are the strong muslims TERRORISTS? and someone explain why does the Quran have many cruel verses about killing the people who don't believe in the Muslim God? The God that is mentioned in the bible is the God of LOVE & no cruel things said. The bible doesn't talk about killing people who don't believe in being a christian... Isn't it commonsense that Jesus is our Saviour?? please do not tell me other things. Don't tell me what I dont want to hear. I just want those questions answered. THANK YOU!! GodBlessYou! JLY <3