I agree with that. But your happiness has no bearing on the truth of your beliefs. This is the point I'm trying to make, yet you just don't seem to get it!!
We have evolved from primal animals, yes. But those instincts are still a big part of our life. We eat food so that we survive and not die out of hunger. The eastern world is still reproducing, and thus still hold it significant.
An honest assessment of all life on earth will only show that there is no higher purpose. Plants, animals, rodents, insects and fishes do not have any purpose other than survival and reproduction. They can neither contemplate their purpose in life, nor give one for themselves. If so, why are they here? And why are we here too?
The truth is that nature is without purpose. The earth, stars, planets, and the entire universe is without purpose. It's all just the result of physical and chemical laws. The idea of god putting us here for a purpose is absurd. A perfect, omniscient being would have no such desires. His perfection puts an end to all purposes he may have. Men created god and religion to give us a false sense of higher purpose. A higher purpose that never was, and never will be.