@Trillian, to respond to a few of your points:
1. I understand that you’re in a “new covenant.” You no longer have to follow the Old Testament laws to be “saved.” However, does this mean that it would be immoral to follow the laws? Certainly Jesus says the opposite—he says you’ll be called “greatest” for following them. Whcih makes sense because they’re God’s laws, and supposedly perfect (despite being impossible to fully follow for us flawed humans).
2. On this note, why would it be wrong to do the Inquisition? The Bible commands that you kill unbelievers, even if they’re you’re own family or best friends (Deuteronomy 13:6). Why would it be wrong to follow God’s commandment?
3. Jesus said a lot of things. He did say render unto caesar and turn the other cheek. But he also said “I have not come to bring peace but a sword,” and in almost all of his parables he threatens people with torture or death if they do not follow his cult. In Revelation, he will return and kill most of the Earth’s population and torture the rest. The idea that Jesus was just some hippie communist moral philosopher is a figment of modern secular society’s imagination.
4. I agree with you that something unscientific could still have good moral tenets. However, the Bible and many other ancient myths do not have good moral tenets. The Bible supports slavery, misogyny, and genocide. It says that gays should be killed. It says that unbelievers deserve to be tortured for not following its cult. Jesus, like Bush, said “those who are not with me are against me.”
Now, you brought up Buddhism—I don’t know much about Buddhism, but I do like some of the moral teachings I know about. I’m more familiar with Hinduism, and I also like some of the tenets there. However, there are many tenets of both religions that I think are just wrong, or stupid. Likewise for the Bible and the Quran—some tenets are good, but many are just barbaric. And I would say the Bible is particularly vile.
The Code of Hammurabi—the earliest law code we have—contains some good moral tenets. It also says that if you build a house that collapses on another guy’s daughter, your daughter gets killed as “justice.” That—like much of the Code, or the Bible, or the Quran, is a barbaric, stupid moral tenet— independent of the fact that these texts are also unscientific and full of factual errors.