Analysis of Jesus Claiming To Be Pure And Sinless

Making the unsuitable suitable New Testament style
It is alleged that Jesus was spiritually pure and sinless and that his supposed sacrificial death was prefigured in the Jewish Scriptures by images and types (e.g. Isaiah 53, Psalm 22).   But who says he was spiritually pure and sinless?  Who says his death was prefigured in the Jewish Scriptures?  Only the tendentiously self-serving authors of the New Testament and their adherents!