To say that objective morality requires God is an oxymoron.
If morality is dependant on something outside itself, it is necessarily subjective.
And without first establishing objective proof of not only the existence of God, but that yours is the right interpretation of the right God who is worthy of being arbiter of morality it becomes even more subjective.
As it is we only need to look at Christianity itself to dispense with this idea.
It is rife with theological and moral differences which have evolved over time and produced conflict over which has repeatedly led to deadly violence.
Exactly what we would expect from a subjective moral system.
Even today the same Christians who are claiming to be in possession of objective morality are engaged in mental gymnastics to explain why half of what was proscribed by the objective arbiter of morality like mixed fabrics and shellfish and now A-OK, but the slavery and genocide he commanded and detailed the proper moral practice of is now no longer, or never was moral.
Christians can claim that God gives them objective morality, but in practice don't have it anymore than the atheist.
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