John 6:63-64 “It is the Spirit who gives life; the flesh profits nothing. The words that I speak to you are spirit, and they are life.  But there are some of you who do not believe.” For Jesus knew from the beginning who they were who did not believe, and who would betray Him.
We are only saved by a calling of God. When our Spirit is convicted by the Holy Spirit, we choose to follow Him. However, some did not/do not believe today because they have chosen to ignore that call. God doesn’t pick and choose who He saves, but we pick and choose who we trust to save us! I pray that you have been saved by His blood.