What is the agreement that god made with man?

The agreement that was made by God was life forever on earth. That opportunity was postponed due to the fact that Adam and Eve have spread the disease of death on mankind. Read Genesis 3: 19 and Romans 5: 12.

2'000 years ago God sent his precious Son on earth to redeem the human race from the curse of sin and death and to undo the damage caused by Satan. Read John 3: 16; 1 John 3: 8.

Psalm 37: 29 reads. " the righteous will possess the earth, and they will live forever on it". The agreement has not changed. Our obedience is still the condition to live forever on earth.

1 Timothy 2: 4-6 reads. " Whose will ( God's will ) is that all sorts of people be saved and come to an accurate knowledge of truth. For there is one God, and one mediator between God and men, a man, Christ Jesus, who gave himself a corresponding ransom for all. "

John 17: 3 reads. " This means everlasting life , their coming to know to know you, the only true God, and the one whom you sent, Jesus Christ."

So to answer your question, the agreement that was made at the beginning of mankind was our obedience to God and His Sovereignty.