Premise 1: If God does not exist, then objective moral values and duties do not exist.
Premise 2: Objective moral values and duties do exist.
Conclusion: Therefore, God exists
this is what is meant by objective moral values
To begin with, let's define what we mean by "objective moral values". Objective moral values are qualities like kindness or love which are morally good independent of the belief of human beings. For this reason, philosophers who affirm the existence of objective moral values sometimes speak about them as moral facts. A purported fact can either be true or false, but it is qualitatively different than an opinion, which is a matter of personal preference. So when we say that objective moral values exist, we mean that a statement like, "Murder is evil," is making a claim about some objective moral reality in precisely the same way that the statement, "There is a chair in my kitchen," is making a claim about objective physical reality. In contrast, a moral relativist claims that a statement like, "murder is evil," is a subjective claim about our (or our society's) preference. The statement, "murder is evil," expresses a subjective preference similar to the statements, "curry is tasty," or, "bluegrass is the best musical genre." If objective moral values exist, then statements like, "the Holocaust was evil," can be objectively true
Just for curiosity, for those who don't accept the conclusion of the argument, which of the 2 premises you consider more probably wrong than true?