Salvation is God's work. What is left for Him to do?

Christ died. He was buried. He rose. I believe.

[1Co 15:1-4 KJV] 1 Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;
2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.
3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;
4 And that he was buried, and that he rose again the third day according to the scriptures:

Noah was shut into the ark by God.
It wasn't up to him. He trusted God.