Imagine there is a truth out there concerning the origin of mankind,
one party puts aside their feelings and wishes, their personal bias etc and seeks the truth armed only with reason and logic to the best of their ability spending a life time doing so...
isn't such party more likely to find the truth and is more deserving of it, as seekers of truth ?
Another party, religious or not, who has done absolutely nothing in the matter, a seeker of comfort and beliefs (although they don't perceive it!), who is filled with personal biases, somehow this person is more entitled to know the truth ?

God has favored us over the other creatures, this, religious people will not cease chanting, but how so ? this they do not care about.
As far as I know, and as little as I know, humans have advanced to what they are now because of reason
From cave-dwellers, with primitive tools, the discovery of fire, the advancement of tools and the advancement of languages, we have evolved and evolved to who we are now, thoughtful people, with laws protecting us from each other and so on, IT IS A MIRACLE ! Again, one needs to realize what faculty, that God has given us and by which God has favored us from the rest of the animals, and by which we are taken from DARKNESS TO LIGHT. Everything is clear.
In regards to morality, in my opinion, one needs to apply that same faculty which allowed us to understand external subjects, to be applied internally, on our emotions and thoughts, on our intents and motives etc, so that we can improve ourselves in a way that befits us humans (rational beings!) and not animals (anger, impulsiveness, selfishness, territorialism, predatory behaviors, etc), such is the good vs evil struggle that we all endure.
Some quotes, from Charles Darwin:
"As man gradually advanced in intellectual power, and was enabled to trace the more remote consequences of his actions; as he acquired sufficient knowledge to reject baneful customs and superstitions; as he regarded more and more, not only the welfare, but the happiness of his fellow-men; as from habit, following on beneficial experience, instruction and example, his sympathies became more tender and widely diffused, extending to men of all races, to the imbecile, maimed,
and other useless members of society, and finally to the lower animals,—so would the standard of his morality rise higher and higher."
Here is the root of evil which Darwin clearly understood:
"Man with all his noble qualities, with sympathy which feels for the most debased, with benevolence which extends not only to other men but to the humblest living creature, with his god-like intellect which has penetrated into the movements and constitution of the solar system—with all these exalted powers—Man still bears in his bodily frame the indelible stamp of his lowly origin."
So I owe it to him to read his writings god willingly sometime in the future! If you can't read his writings, atleast check out his quotes.