Free will is true. You're exercising in right now. Are you not aware of the scriptures of God's grace shining on all men?
[Each person can prove this for themself.] That's what Pelagius thought as well.
Palagius's error was not that God made man with free will. It is an error, however, to deny it. An error, again, that is capable of being disproven by each person at each moment of their conscious existence.
Including you. Right now.
I am exercising my will according to the faith given to me. A person with no faith cannot exercise any will towards God. All things come from God. There is nothing that we have that hasn't been given to us.
Palagius's error was not that God made man with free will. It is an error, however, to deny it.
Pelagius view was man was free to make his own choice. Doesn't this sound a tad familiar?