"In Jesus Christ neither circumcision availeth anything nor uncircumcision, but faith which worketh by love." Gal. 5:6. With those who were in mind when this scripture was originally written, circumcision was everything, and it was everything simply because of what it represented. And what circumcision represented to those people was works and works only. It was the greatest of all works -- greater than creation itself -- because, as the rabbis put it, "So great is circumcision, that but for it the Holy One, blessed be He, would not have created the world." "It is as great as all the other commandments," "equivalent to all the commandments of the law." -- Farrar's "Life of Paul," chapter 22, para. 5, note; chapter 35, para 4, note. Yet this which to them was so great, the Lord sweeps away, as with a blast, in the words, "Circumcision is nothing," and in Christ Jesus, circumcision avails nothing. And, in view of what circumcision meant to them, this was simply to say that works are nothing and in Christ Jesus works avail nothing.
"If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness." 1 John 1:9 KJV. The key here is that ‘He is faithful’. Who is faithful? God is faithful. Our salvation and all the good things now and forever depend on the love and faithfulness of God to keep His promises to us, to forgive us and to help cleanse us from all unrighteousness and to provide all the other gifts that He wants to give us.