Is it true that there is no absolute morality?

[Astreja]

True. But it would set a standard by which all morality is measured.  

So in practice if morality was based on that standard then it would not fluctuate because of individual circumstance and environment.

Morality is not generally a matter of individual  circumstance, but best practices as determined by groups of people.  A culture with an "every man for himself" approach to morality is generally less safe and more prone to breakdown than a culture that promote the safety and happiness of its members, and I think you'll find that successful cultures have well-evolved moral standards.

I find many people have a moral objection to the Christian God's actions found in scripture.  This always feels ironic to me if we live in a world where all morality is subjective and does not transcend everything.

That's because over many generations we've created a superior moral standard to the one in the Bible -- a standard that has improved the quality of life for a greater number of people, resulting in a more productive, more advanced culture.  We're now curing diseases and collaborating on peacekeeping missions rather than arguing about the proper way to treat slaves, or stoning people to death for working on the Sabbath.