If I said that the Apostles creed fully communicates my faith, but a portion of the nicean creed does not, the the remainder does, how does this give you the knowledge that I am or am not saved?

1 Cor 12:3 KJV Wherefore I give you to understand, that no man speaking by the Spirit of God calleth Jesus accursed: and that no man can say that Jesus is the Lord, but by the Holy Ghost.

Joh 7:38 KJV He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.

Mat 16:15-17 KJV He saith unto them, But whom say ye that I am? And Simon Peter answered and said, Thou art the Christ, the Son of the living God. And Jesus answered and said unto him, Blessed art thou, Simon Bar–jona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven.