“Only if God changes your nature can you answer God’s call.”
Actually, Jesus said, “you refuse to come to me that you may have life” - note the order, come before life. And John wrote “and that by believing you may have life in his name.”
Believe, and receive life. That is the order God’s Word gives. If your theology has a different order, I suggest aligning it with God’s word.
If you can do it without God changing your nature then you are your own savior. By nature you are good enough and smart enough to Make the good choice to follow Christ.
So are all those verses about the “natural man” just empty words? Or is natural man indeed incapable of independently turning to Christ and your whole premise false?