You're ASSUMING "man has to do" something.
According to Ezekiel, it's all God.
Okay, we can go to the NT if you like...
2Pet. 1:9 For whoever lacks these qualities is so nearsighted that he is blind, having forgotten that he was cleansed from his former sins.
"he was cleansed".
PASSIVE voice.
Something done TO us.
God cleansed us.
1John 1:7 But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin.
Christ's blood cleanses us.
It's done TO us.
By God.