It is disingenuous to continue an argument by ignoring evidence otherwise:
KJV Numbers 15:29 Ye shall have one law for him that sinneth through ignorance, both for him that is born among the children of Israel, and for the stranger that sojourneth among them. 30 But the soul that doeth ought presumptuously, whether he be born in the land, or a stranger, the same reproacheth the LORD; and that soul shall be cut off from among his people.
I'll add a second witness also:
KJV 1 John 5:17 All unrighteousness is sin: and there is a sin not unto death.
Perhaps you would be better served to read all of 1 John 5.
This is a great scripture, you should familiarize yourself with it.
10 Anyone who believes in the Son of God has this testimony in his heart. Anyone who does not believe God has made him out to be a liar, because he has not believed the testimony God has given about his Son. 1 1And this is the testimony: God has given us eternal life, and this life is in his Son. 12 He who has the Son has life; he who does not have the Son of God does not have life.