Objective morality

Why we don't have christian chemistry, muslim chemistry and jew chemistry? Because chemistry is a science, and every science is objective, because it is always based on objective premisses.

So the same way that the only one true chemistry, or math or physics is the one that is based on objective premisses, and the others based on subjective premisses (like faith or personal beliefs) are all false, the same rationale we can use to morality.

The only true morality is the one that is based only on objective premisses, ie, reason and science, and not personal faiths or beliefs.