In fact, they say that God has given this free will and He will not interfere with it whatsoever. Even though He may want a man to do something, if the man does not will to do it himself, God will do nothing to change his will. Secondly they mean that from an ethical, moral point of view man's will is free to choose either good or evil. Man has the ability to choose the way of sin or to choose the way of righteousness. His will is not inclined to go one way or the other.
Man has equally the ability to do either good or evil.
He is spiritually free. Thus with his free will a man can either choose Christ or reject Him. He can either choose to be a Christian or refuse to be a Christian. The choice is strictly his. While people or things may influence him one way or another, ultimately no one and nothing can make him choose Christ or not.