I agree man must believe, but God grants belief and salvation, so that no one can boast. It's all of the grace of God! amen!
I don't boast because I responded in faith and believed. In fact if God didn't first give me a new heart, I would be unable to have responded in faith and believe. God gets all the glory.
I believe you are seeing the monergistic side of salvation, but are either unwilling or unable to see there is also a synergistic side to salvation as well.
I assume you believe that unless a man repents, he cannot be saved. And it is stated in Scripture that God commands man to repent.
Acts 17:30 - God now commands all people everywhere to repent
God cannot do our repenting for us. God has commanded all men to repent. It is a work which only they can do. It is morally impossible for one person to repent for another. Even Christ could not do this. He could die for us, but He cannot do our repenting for us.
God in His mercy may incline us to repent (the goodness of God leads us to repentance Rom 2:4) and by His inworking Spirit assist us to repent; but before we can be saved we must personally and individually repent toward God and believe in Jesus Christ if salvation is to be the result.
Therefore, even repenting which is in command form must necessarily be synergistic in nature. There is no such thing as monergistic commands. Commands cannot possibly be monergistic. That would go against the definition of monergistic.
Another thing God commands men to do is to believe.
1 John 3:23 And this is his commandment, that we should believe in the name of his Son Jesus Christ
Once again if man is commanded by God to personally do something, then both repentance and belief being in command form eliminates the possibilty of those acts being monergistic.
Something that is monergistic in nature is given in the following manner: God says: "I will give you a new heart." (There is no command or response required from man in that statement, thats true monergism)
Once again those things that God commands men to do cannot possibly be monergistic in nature. A command demands obedience, and it requires a synergistic act from man to obey. Its the same as when I command my son to go pick up his room. He is required to go do something. Picking up his room in obedience to what I commanded makes it a synergistic act. I didn't monergistically do it for him. It's no different when God commands men to repent and believe.
It may be interesting to get responses on this from other members in this forum as well.