God does not exist, I aspire to achieve moral behaviour. So I find the phrasing of the question to hold a false assumption.

If God were to exist (I'll skip the idea of proving existence; Thomas Aquinas dealt with that before me), would I change my moral stance? That's a good question, actually. If you are moral because you fear retribution (divine or otherwise), are you truly moral, or just afraid? Does a Western-style God, who demands you behave according to His standards OR ELSE, even deserve obedieance? Or is He more like a spoiled three year old?