...as every religion claims. The point is that religion is just another personal opinion.
ETA: Next time I would use a different example as a level is based on basic engineering/science.
Morality cannot be based on science.
Science = Logic (it used to be at least
)
Morality is not based on logic. If it was, we would simply call it "logical" (and not "moral")
For example:
Tell me based on "basic engineering/science" why it is immoral for a mother and her son, or brother and sister to have sex together?
Why is it OK to kill a fly but not a human? Who decided that human life is greater than that of a bug?
U can't! There is no logical reason!
SO WHY IS IT IMMORAL?? WHO SET THE STANDARD?
The answer is that morality comes from God.
God says it is wrong to have sex with a sibling, parent, aunt, uncle, other family,
and someone with the same sex as you.
God also says it is immoral to kill someone.
There is no other way around this....