If Jesus, who became man, was not God, He would be just like us and could not save us. Study and believe the words of the Bible. Because Jesus was both God and man, God caused Him to have a unique birth. Because He is God, He cannot be held by death. Because He is God's beloved Son, God raised Him from the dead to heaven.
Believers have everlasting life.
They will all be raised on the last day of the world. If Jesus was not raised from the dead, no one will be raised. The disciples were in great fear after Jesus' crucifixion, but after Jesus' resurrection they became courageous. Thus, in order to believe, one often needs to use faith and reason together. God gave man the ability to reason, desiring man to use this ability to reason as much as possible, but man should also accept that his reason is incapable of completely understanding God's omnipotence and wisdom.