What man ought to do is not the same as what man can do. Fallen, arrogant man is responsible to a Sovereign God, as all is subject to and responsible to the Sovereign God. However, fallen man is in a state of spiritual blindness and death, indeed is born and lives his life on earth in open and continuous rebellion and rejection of God. God in His Providential Free Will exercises His Free Will to choose to give new life to those whom He Wills, which is exactly what the teaching of Christ and Apostolic teaching of Scripture clearly teaches. Where both the Romans and Greeks went astray was the acceptance of Aristotelian concepts of "free will", that ultimately makes man's will sovereign, and makes man responsible for his own salvation, whereby God looks down on man and rewards him for making the right decision, thus finding some inherent goodness in man that makes God reward him with heaven. God is telling us that we do have a say in our destiny. He offers us salvation. Ours is to accept it and give ourselves to Him.
Thus you are the ultimate cause of salvation.
Do you believe that Cain is Adam’s biological son through intercourse with Eve? Yes or no?
The Church does not teach that we are reponsible for our own salvation. Only God saves us. We are responsible for our wickedness and perdition.
MLG: Thus you are the ultimate cause of salvation
Nope. God makes the offer. WE must either accept or reject His grace. You do admit that we can reject His grace, right? We can choose to stay wicked, right?
God gives us a choice. Come to Him and be saved, or reject Him and perish. Your formula is a partial God (the bible make sit very clear that God is impartial) who leaves us no choice. Believe what you want. The choices you make in life carry consequnces and the responsibility for those consequences are entirely yours. That inlcudes giving ourselves to God.