I thing you miss the point. Yes, we all sin. Liberalism enshrines sin, it is based on sin. Envy, jealousy, theft. force are the very essence of statism. If you are a statist, of any strip, then you put the state in the place of God. It is on thing to be a sinner. It is another to brazenly build your life on sin.
You are spot on! The abortion issue brings it all into focus.
Now we have the LGBT crowd and god-hating leadership trying to tear down the family in every way.
That is something I have been thinking about recently, after reading a book about the abandoned wife and children of the poet Lord Byron.
He was a person entirely devoted to vice, wreaking havoc on the lives of all around him, leading many to destruction. However, both in his lifetime and since, biographers have brushed this off with, "Well, his wife wasn't perfect, either."
There is a category difference between a person who makes mistakes (errors in judgment, honestly believes some things that turn out to be wrong); and a person who sins, as everyone including the greatest saints does; and a person who, as you so well put it, "brazenly builds your life on sin."
We seem to have lost this distinction in our drive for moral equivalency, "Well, everyone makes mistakes ...," "Nobody's perfect," etc.
All very true - I just object pointing fingers at the Left when there are plenty of folks on the Right that do the same. Is the Left based on more inherently evil thoughts and actions - yes. Are our own sins just as vile to God as theirs - yes.
When we point to another, or another group, as being more sinful, we are in danger of making excuses for our own "lesser" sinfulness - that's my point.
I know some atheists who act as good and decent as the most devout Christians It grieves me to have a good person going to his death without being saved by the blood of Christ. I also know some saved Christians who act pretty dang evil as a matter of course - often deluded that they are better than they are. His love is constant and we should carry the Word instead of pointing fingers that condemn without speaking the Good News.
I am a sinful and sorry human that has been washed clean by His blood and I sometimes agonize over my faulty condition. At the same time I rejoice that he has stated He would forgive my wickedness and recognize my sins no more - that's the ONLY advantage I have over those who have not accepted His agonizing and perfect gift to us.