God is holy, holy, holy beyond human comprehension.
This is why he sent his only begotten Son into the world to overcome and defeat sin, death and the devil.
As far as God is concerned Jesus has victoriously defeated sin, death and the devil and in doing so has reconciled us and the world unto God, 2 Corinthians 5:18, 19.
Jesus now sits in heaven at God's right hand as "The King of Kings and the Lord of Lords" Revelation 19:16.
God sees all things in his Son Jesus Christ, Colossians 1:20-22. Where God sees sin there is judgment and condemnation. This why God sees EVERYTHING in Jesus Christ.
When Jesus returns all that are "In Christ" and have the Holy Spirit will be saved. Those outside of Christ will be lost.
Agreed, yet still doesnt answer your assertion that " God cannot see all things" and actually this answer supports Gods omnipresence, and omniscience.