Secular societies are happier are they? Like the USSR and the People's Republic of China?
Or in Denmark, the child pornography capital of the world?
Although many atheists maintain their moral sense, the moral pit of "everything is permitted" thinking should not be underestimated.
Communism began, I believe, with Marx's secularism combined with a genuine concern about economic injustice and the intent to do something about it. And the results are now in the history books. If you really think that secularism can make life better, the first thing I want to see is that you have figured out what the lessons were from this massive failure and have learned those lessons.