I don't think you can condemn Christianity because it parallels other "good" philosophies. As you have said before everyone knows not to steal and murder but I don't think it is grounds for complaint when the Bible repeats it.
The problem is, and we see it time and time again is that people take the Bible out of context and say things like "the Bible says slaves should be beaten" which is plainly wrong except as we have seen if they become drunk and unruly and beat their colleagues and then they will be punished in the same way they mistreated those around them.
The Old Testament teaches an eye for an eye or to put it another way for the punishment to fit the crime and that limits the extent of it thereby protecting the law breaker and the Bible expressly says not to take vengeance. The New Testament says to turn the other cheek.
This is the spirit that runs though the entire Bible, it is a spirit of love and protection, caring for others, self sacrifice, and giving more than you need, for example going the second mile. Breaking the law will result in punishment.
Then along come people of ill-will and quote the punishments and put that forward as Christian teaching which it isn't at all, the Bible is about behaving in an honourable manner and if you don't and only then will you be punished, which happens in all societies and without it there would be anarchy.
Unfortunately there are people in Christian churches who are reprehensible themselves and in my opinion should be routed out, but what I feel we need to do is to look at what the Bible says for ourselves and study it with sincerity of heart, rather than look to those who would seek to mislead.
