The universe, nature around us, and life show us that there is something fantastically great behind everything that exists. If there weren't, researchers would have developed life extension so that we could all live to 1000 years old, long ago.
Why do you say that? Is your claim that, because it took our monkey brains hundreds of years to develop understanding and tools to understand biology, that biology is too complex to be created by anything but a god? Why does a system have to be simple for it to be natural? And, let's say our society collapses, and we lose a lot of our knowledge. Does the fact that it would take centuries to rediscover how to make something as complex as a computer CPU mean that CPUs are made by god? Or better yet, what will you be claiming when, in 50 years or so, we DO figure out how to live to 1000? (We're actually very close, since we understand almost all mechanisms of aging at this point, and are now just working on ways to repair and modify them)
As it is, research is still just finding out some of the basics of life. And we certainly don't have the ability to travel the universe. We can barely get off our own planet. Since we don't have much of a handle on anything - like we don't even know how to will ourselves to grow back a finger when we lose one - where does all this complex universe come from?
Why do you say it's complex? That's just your personal opinion, based on your lack of knowledge. Life and the universe are fairly straightforward to biologists, physicists, and engineers. You are arguing from ignorance here, basically claiming "I don't understand, so no one else does either."
We use religion basics in our everyday lives. We "religiously" do certain activities all the time - eating, sleeping, going to the job, breathing.
That's not religion, that's biomechanical processes and instincts
We do them because our body sends signals making us crave those things, and rewards us with physical evidence when we complete the tasks. You don't eat food because you have faith that you are hungry, and have faith that you will feel full after. Conversely, a person born in a society that doesn't believe in god or Jesus (such as in Islamic, Buddhist, Shinto, or atheist society) doesn't get cravings for Jesus.
Think long and hard before you decide to bypass religion.
Every atheist in America has. You may assume that atheists started out that way, and just haven't considered the idea of god before, but in fact America is absolutely steeped in religion. 80% of it is Christian (which is why we laugh when they claim religious persecution, or claim they are courageous to say they love Jesus in public), and religion is mentioned everywhere almost daily. So atheists almost always start out christian here,believing what you believe, and then get educated, start questioning and thinking, and come to their senses, realizing that Christian stuff doesn't make sense.
Some of that religion is about God, the Guy Who holds your life and existence in the palm of His hand. To see it, simply look at nature around you, and see how your existence fits into everything that exists.
Fitting into things that exist is evolution, not god. You, as a species, would not exist in your environment if you didn't fit into it, because you would either starve due to lack of food you need, or get eaten due to being weak and stupid. So of course every living thing fits into everything that exists. Those who didn't went extinct long ago.
