The Bible says you died with Christ and it is no longer you who live but Christ who lives in you. Therefore the faith you exercise and operate in is not your own but the faith OF Jesus.
The NKJV’s translation would lead you to think it’s about you and YOUR faith IN Christ.
“I have been crucified with Christ; it is no longer I who live, but Christ lives in me; and the life which I now live in the flesh I live by faith IN the Son of God, who loved me and gave Himself for me.” Galatians 2:20 NKJV
But looking at the King James and the Young’s Literal Translation and you’ll see this in a whole new light.
“I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith OF the Son of God, who loved me, and gave himself for me.” Galatians 2:20 KJV
“with Christ I have been crucified, and live no more do I, and Christ doth live in me; and that which I now live in the flesh–in the faith I live OF the Son of God, who did love me and did give himself for me;” Galatians 2:20 YLT98
Check out this verse too;
“knowing that a man is not justified by the works of the law but by faith IN Jesus Christ, even we have believed in Christ Jesus, that we might be justified by faith IN Christ and not by the works of the law; for by the works of the law no flesh shall be justified. Galatians 2:16 NKJV
But it wasn’t YOUR faith in Christ that justified you. It was HIS faith that justified you.
“Knowing that a man is not justified by the works of the law, but by the faith OF Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith OF Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.” Galatians 2:16 KJV
“having known also that a man is not declared righteous by works of law, if not through the faith OF Jesus Christ, also we in Christ Jesus did believe, that we might be declared righteous by the faith OF Christ, and not by works of law, wherefore declared righteous by works of law shall be no flesh.” Galatians 2:16 YLT98
So if you’re struggling with whether the faith you have is sufficient. The answer is YES! Believe and know that HIS faith IS your faith. HE is the author and finisher of your faith. Don’t just have faith IN Jesus, exercise the faith OF Jesus!