Now of course, in some sense, like most prevalent false statements, it has some truth to it. All sin leads to death. All sin deserves death. All sin separates us from God. Jesus blood is for all sin. And I'm sure you can come up with many others.
So if someone is using it to demonstrate that all sin needs to be dealt with, for instance in evangelism, then perhaps it's helpful.
But there is one enormously important sense in which it is categorically untrue, unbiblical, and, frankly, stupid. And that is in thinking that God has the same feelings toward all sin.
Passages abound. Almost every page of the Bible seems to have this concept. In fact, when does God ever, in the Bible, not distinguish between sins? God waits for the sins of the Amalekites to reach it's full measure. God punishes the sin of Sodom and Gomorrah, and Ninevah, and Babylon who he called against his own people but later punished them for it. Is it that these people did 1000 sins, but other nations only did 500? Because if all sin is the same in God's eyes, then that's the only conclusion you can come to - and it's a silly one. Of course it's not about quantity! It's about quality! The sin of Sodom was really bad sin. The sin of sacrificing one's child is a particularly bad sin.
Now my Sunday School teachers assured me that 'there is no such thing as a white lie'*. I appreciate what they were getting at. Lying is bad, and claiming that nobody really got hurt does not exonerate you. But this doesn't mean there aren't really black lies does it? For the sake of not treating some sins lightly, we seem to have simultaneously rejected the notion of treating some sins heavily.
I think this is really dangerous.
*This is a topic for another blog post. Spoiler alert: I think there is such a thing as a white lie.
(I've ranted about this before, and it may have been on this blog. I had a quick flick through and couldn't find it though, so I think I ranted about it elsewhere)