I am not going to retrace the arguments for objective vs subjective morality, or religious vs secular morality. I am only going to posit my view on the subject very briefly here.
Morality is subjective, even if one accepts the unsupported claim that it comes from a god (Hello, God is a person, right? A person is subjective). Most humans have an embedded sense of right and wrong, good and bad. I think most sane humans can agree that morality is the highest level of well-being for the most numbers of feeling beings. From there, humans acting in organizations can use the tools of science to determine what objective actions maximize well-being. Simple.
SCIENCE (from the Latin for 'knowledge') informs wisdom, reason and humanism. This is a 4-legged worldview within reality that maximizes well-being for individuals and society.