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Sin is an act of the will.

The Book Rome assembled disagrees with you.

Leviticus 5:17-19 Douay-Rheims 1899 American Edition (DRA)

¹⁷If any one sin through ignorance, and do one of those things which by the law of the Lord are forbidden, and being guilty of sin, understand his iniquity,

¹⁸He shall offer of the flocks a ram without blemish to the priest, according to the measure and estimation of the sin: and the priest shall pray for him, because he did it ignorantly: and it shall be forgiven him,

¹⁹Because by mistake he trespassed against the Lord.

Oh look, you can play word games. In your own citation it clearly shows that there is a difference between sin committed in ignorance that done deliberately. The Bible recognizes different levels of sin:

If anyone sees his brother sinning, if the sin is not deadly, he should pray to God and he will give him life. This is only for those whose sin is not deadly. There is such a thing as deadly sin, about which I do not say that you should pray. All wrongdoing is sin, but there is sin that is not deadly. (1 John 5:16-17)

Since we are talking about sin that would separate us from God I though that you would have understood that I was speaking of what we Catholics refer to as Mortal Sin (grave matter, sufficient reflection, and full consent of the will). I did not think that I had go into a whole discussion of the Catholic understanding of the differences between Mortal Sins and Venial Sins.