That's just it! people do not become children of God, by faith in Christ.
I have explained this to you time and time again that the natural man only has faith in mankind, and what he accomplishes, which is not spiritual faith. To repeat myself; Spiritual faith is a fruit of the Holy Spirit, and only comes with the indwelling of the Holy Spirit in the new birth. The new birth is given by God's sovereign grace, without any participation of mankind.
Your agenda is to get the natural man to have the ability to believe in the things of the spirit, which contradicts scripture. I know that you do not like me mentioning harmonizing the scriptures, but you will not be able to understand the doctrine that Jesus taught if you have contradicting scriptures.