An nowhere has anyone said otherwise, you have been corrected with scripture when you said all sins are equal.
In that all sins make us forfeit of the kingdom, save grace, you are correct. In that the word never ranks sins, you are wrong!
My (Episcopal) religion ranks sin as either mortal or venial...a mortal sin is stated as murder but can also be one of cruelty to animals and are ranked the same. A venial sin basically is something left undone that should have been done ... however, both are sin as sin as defined ("missing the mark") and are both offensive to God.