No, really I did see someone say almost exactly that today. Someone who considers himself to be a pastor/teacher and online blogger. His exact words were:
"Mortify sin, or stop calling yourself a Christian."
I have to wonder exactly what Bible these guys are reading. I told him I think it's this one:
"for we know that it is by grace that we are saved, after all we can do."
In the course of this back and forth he informed me that Jesus is not going to obey the New Testament for me. Huh. The way most Reformational Christians read the Bible, they find that Jesus DID obey the entirety of the law in my stead. Not only did he expiate, he propitiated.
So, as Jesus said, it is FINISHED. Τετέλεσται
I'm not going to argue with Jesus on that anymore.