No, not what I said, at all. I said absolutely feel free to do whatever you THINK is right. Those two words are very important.
You asked does right and wrong exist in a universe without God. My answer, is clearly yes. You are now changing the question to "what is right and wrong", and my only answer can be to study those that have come before you, understand their philosophy, understand the questions people have poked in the philosophy, and use it to evaluate your actions. Then choose the most optimal action. If you wish to judge me, judge me the same way. THINK, and THINK in the context of RIGHT/JUST/ETHICS.
There is no script for right or wrong in every case, either in the Bible or in secular belief. It has always been application of philosophy by way of careful thought. I feel the biblical version is myopic, and founded on a fundamentally flawed premise. That is not to say it does not have merit.