Do a little research on the Golden Rule to see just how exclusively Biblical it is. Not.
The Bible has plenty of instructions that everyone would agree are great ideas, like "thou shalt not kill". It also has plenty of instructions everyone would agree are terrible ideas, like much of Leviticus. The good ideas are not only common sense, but they can generally be found in other sources pre-dating the Bible by centuries.
Consider the possibility that the good ethical advice in the Bible is not good ethical advice because it's in the Bible, but rather its human authors put it into the Bible because it's good ethical advice. It's a reflection of human nature, much of which is benevolent.
This may make the Bible a good moral guide if you cherry-pick the sensible parts, but it certainly doesn't establish its God as the only source of morals.
- SmartLX