Sure, but that is hard because religion is such a big part of our history. There aren't many large scale things from the past you can describe without talking about the influence of religion, because well, religion was there and it was pretty prominent.

However, that doesn't say much about whether religion was necessary for morality to substantiate. In fact, so many immoral things have been carried out in the name of religion, that you might as well wonder if we would have been much more morally advanced by now if it hadn't been for religion.