Question: But can those converted to God keep these commandments perfectly?

Answer: No. In this life even the holiest have only a small beginning of this obedience.[1] Nevertheless, with earnest purpose they do begin to live not only according to some but to all the commandments of God.[2] 

[1] Ecclesiastes 7:20; Romans 7:14-15; I Corinthians 13:9; I John 1:8.
[2] Psalm 1:1, 2; Romans 7:22-25; Philippians 3:12-16.