The finding implies that complicated burial rituals existed in early human societies.
Lake Mungo remains - Wikipedia, the free encyclopedia
First of all, it also implies that they burned the bodies so the animals wouldn't eat them, or because they didn't like the smell or knew that they could get sick...
Secondly, even if that is a ritual, that in no way proves that spirituality is a natural part of man, only that some early humanoids practised it, maybe they were the first ones to do it. Like stone tools, which aren't inherent to humans either.
Thirdly, it's not a scientific link, it's Wiki, and anyone can write anything or change it how they want, including you.
So, I ask yet again, got anything scientific for real?