> And also doesn't Christianity give some good excuses to question or review these? Especially, considering that New Testament builds up on top of the Old Testament. I'm asking about the stuff around the quotes you've shown (otherwise we could fall for confirmation bias).
To some extent, yes. Also, there is a long tradition of theological debates in Christianity, right from the beginning. Christians are much more comfortable with the idea that the Bible should not be taken literally.
Of course, there are 2 points that show up immediately when you say that. First, some Christians are literal fundamentalists so a long tradition is not enough. Second, Islam also has a long tradition of theological debates, and many different views and movements. I am not familiar enough with the History of Islam in the 20th century, but the fact is that there are lots of aspects that we associate with the religion without second thoughts that are actually Wahabbi practices. The rules against sex and alcohol are no less strict in the Old Testament than in the Quran. There is no reason why Islam would have to be more literal than any Christianism.
> With Christian rules, it's easier to find excuse to augment or re-interpret them. I'm not saying there's no rules.
That’s because we let a fundamentalist sect (well, mostly 2) redefine a whole religion.