'Morality' is the name we give to the way we worry about the way our actions affect other conscious creatures.
When we use the words 'should' or 'ought' in a sentence we need to recognise the unspoken part of the statement.
If our goal is to promote the flourishing of conscious creatures, then we ought to ...... (fill in moral edict)
This is how we get an 'ought' from an 'is' - David Hume was wrong about that. For example it is an objective fact that female genital mutilation does not promote human flourishing. Therefore we can state that it is objectively wrong.
The problem with religious morality is that it is confused about its objective. Is it to promote the welfare of others - love your neighbour as yourself - or is it to unthinkingly obey a omnipotent lawgiver?
In practice it is both, but then we encounter a dilemma when obeying god leads to damaging the welfare of others. Religion has no moral system; it has a shopping list of edicts with no underlying foundation.
Genuine objective morality is only possible by first putting aside religion's claims on our ethics.
If somebody does not agree that human flourishing is the only sensible basis for morality then they need to define what they mean by morality.