I think the title could technically be correct, but it is phrased in a way that implies a lot. The word “bad” implies a lot of things that Christianity as a whole doesn’t agree with. We are “children of God,” and “made in his image.” We have self-worth.
A better phrasing is “we are all flawed, and have done bad things, and we should feel bad about having done those bad things.” And, even there, that’s just step one. Step 2 is “However, if you repent of those bad things and try not to do them, then you do not need to continue feeling that guilt. The guilt is only there to keep you from doing the bad things.”
Now, of course, I’ve completely left out the spiritual component, because you also basically did. Because the spiritual component is that the only reason we can repent is because of Jesus’s sacrifice, which releases us from the inherent result of those bad things we do. I also left out the message that, by repenting and turning away from those bad things, Jesus’s sacrifice will allow us to live forever.
But, honestly, as I get older, I think those spiritual parts, while important, are not as important right now as the non-spiritual parts. I don’t need everyone to be a Christian, but I think the world would be a much, much better place if everyone adopted the moral framework presented.
Instead, I see people either excusing bad things to alleviate guilt. Or just ignoring the past without trying to do better. Heck, both of these things are just as common in Christians, because they are human nature. I have to fight it, too.
I also think that, by and large, what the Bible describes as bad is a good start for what actually is bad. I think there’s the issue with homosexuality, which I continue to argue is a mistranslation. But, from a secular point, that’s not relevant. If that part is bad and contradictory to the good principles, throw it out. Throw out stuff that treats women and men differently, since the Bible says that God is no respecter of persons and that there is neither male nor female in Christ Jesus.
But that’s getting off topic. My point is, while I could see how the title is technically correct, it’s presented in a way that implies things it shouldn’t, and leaves out things that are essential to understanding the Christian viewpoint.
If it were as awful as the title makes it sound, it wouldn’t have caught on in the first place. Even if you do think there are particulars that are awful, or disagree with the spirituality.