Well, the Catholic church teaches that there are different grades of sin, mortal and venial.
I’m curious just where in Scripture the Catholic church finds this distinction made and would like the Scriptural support for it.
It will be a convoluted answer, you can count on that.
Like I do with leftists, I attempt to understand the worldview of those that disagree with me.
I can state that you are assuming (as do I) that scripture is the final word on an issue such as this.
However, they do not. The Church/Priesthood (made up of fallible men) is the final word on doctrine to them. So asking for scriptural references is meaningless.