ICANT writes:
So what would I gain from being an atheist
Well, it frees up time spent at church, or praying, or giving thanks for food. But that's not really a big benefit. It also frees you from the rituals and tenets of any religious book (weddings, Christmas presents, Ten Commandments etc), or at least provides no obligation to follow it. That frees you from any messages of intolerance or ignorance preached within that holy work or by holy men , and
I guess it would also get you into heaven if the philosophical "reverse god" (who punishes thesst and rewards non-theists).
You could also get along better with atheists, which could be useful had you just fallen in love with one or if one of your family was one.
Lastly, and probably the biggest benefit, would be the exact same as you would receive with any belief - the feeling that your belief about reality actually matches reality, based upon your experience of that reality. This is the main reason why people opt for a belief, and it is entirely under the influence of what glimpses of reality they receive.
ICANT writes:
and believe I evolved from from a single cell life form, that nobody knows where it came from, how or why?
Well, the 'why' question there is useless if you already chose the above atheist idea. But if you didn't, then they why would be "because the Creator(s) willed it so" or something like that.
Anyway, the main benefit of accepting the idea that you are descended from an ancient microbe is the same as the main one for atheism - it matches what you see in reality.
Another benefit is that it allows you to understand the rest of biology much better. As Theodosius Dobzhansky said in the title of his famous paper: "Nothing in biology makes sense except in the light of evolution" (I suggest you read that paper if you can get it; Dobzhansky was a theistic evolutionary biologist). Without evolution, the only explanation is "That was how it was created", but with no 'how' it came to be.
Lastly, it is could offer much better experiences with plants and animals, as you would know that they were once your relatives, and aren't really that different from you. Compare this to the idea that man can do whatever he likes to animals or the environment, because he was given "dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth." (Genesis 1:26). Note it says dominion, as in dominate, not custody or care.
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