Creation, without any doubt.
That is, after the 'big bang' the particles and dimensions were formed we respectively exist out of and live in. Then it took a few billion years for the universe to cool down during which galaxies were formed. On some planets with the right environment variables, life started to develop. Some of those worlds died prematurely. On the planet called earth life became very successful in the oceans. The first mass-extinction happened when the level of oxygen (a waste product in that time from living beings) became too high. Other species adapted themselves to use oxygen and this form of life reached its peak on land, in the seas and oceans with the dinosaurs. Mammals were the size of rodents during that time and played hardly any role. It was probably their size which saved them from extinction after the meteor hit the earth and nearly all dinosaur-species died.
About 200,000-150,000 years ago, those tiny mammals had developed themselves into a wide variety of species, including Primates. Some of those primates we call Humanoids, but those didn't develop only in the branch of the Primates. It is estimated that more than three different Humanoid species lived around that time. One of them (which is assumed to have its roots in Africa since the first fossils were found there of this species) spread out all over what we now call Europe and Asia. The other Humanoids quickly disappeared after those newcomers appeared, although there was contact between those different species (Certain genes, like that for red hair, are assumed to be Neanderthal genes). Then the remaining Humanoid species reached America during the last Ice-Age when there was a landbridge between Alaska and North-Asia, those became the 'indians' Columbus 'discovered' many centuries later.
And now we're here.