Yes, more or less, it is. The Old Testament Law was absent grace and was given the Jews in order to give them simple rules easy to follow. Christianity arrives to a deeper understanding of sin as willful defiance of God, not an ignorant mistake. Note, also that the Hebrew Law is very lenient in this case.
Poorly catechized I see.
Or maybe WELL catechized!!!
At least NON-biblical reasoning is sure in evidence!!