We wait for Jesus, who is coming back from heaven; he is God's son - God raised Jesus from the dead after Jesus had died as penalty for our sin; Jesus delivers us from the wrath to come (when God will judge the world).
This is best to understand when we think of God's wrath against sin like a bush fire, if you want to be safe you have to burn some ground ahead of the bush fire and then step onto the already scorched ground. When we belong to Jesus our sin has already been dealt with on the cross and when God will judge the world his wrath will find nothing in us to burn away.
It is important that Jesus is coming back for us and that God will judge the world but it is not important to know when and how that will happen, as long as we are ready.
Both these important elements are under-emphasized by the church nowadays probably as over-reaction to previous generation's preaching of doom and the fear which has been created then.
But only if we know that we have to account for what we have done and that we never can live up to God's holiness we can see our need for salvation. He can't just overlook our “small mistakes” - any sin is completely incompatible with his holiness and only in Jesus we can have fellowship with God, who dearly loves us and doesn't want us to perish.
God hates sin but loves the sinner and wants him to become free from the power and punishment of sin.