In one of Jesus' parables is your answer [Matthew 13:24-30],especially verse 29 and 30 of this passage. It basically says that God has a time (the end of the world) to gather up the wicked and punish them eternally. If he gathered up the wicked now, some of God's children may be uprooted also. 

Amen Waihun. God has his perfect way and time for all things. God's time is not our time. 

Hello gw

Judgment will come one day for all of us, but not now. And what will make the difference between eternal life or otherwise will be the blood of the Lamb. The bible has said ...

[Isaiah 46:6]
But we are all as an unclean thing, and all our righteousnesses are as filthy rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away.

If God were to judge us right now without His blood, none of us would be spared. So, God does not exact judgement on people and we must be glad because in so doing, we ourselves are spared.