Let me help you with this construction.
I once saw Dawkins refer to his views as a "belief system".
First, do you have a link to this because I'd like to see it in context. If he was talking about his scientific beliefs, then sure, that's a belief system. However, atheism is not a belief system. You may have the two confused. You can be atheist yet believe humans sprung out of flowers 60 million years ago. Atheism says nothing about what a person DOES believe.
You're being atheist too when you reject thousands of gods. I bet you don't even think about it. Just because you don't believe in Ra or Dionysis, you know that would say nothing about what you DO believe. In short, atheism is a lack of belief, and that's it.
So, no atheist is forced to believe:
That life came from non-life [probably many times] But if we're on the subject, it only had to happen once. All life came from ONE ancestor. Every living thing today shares similar DNA.
That people came from FISH (fish are in mans actual ancestry in evolutionary phylogenetic trees) Yes, if you go very far back our ancestors used to live in the sea. But we're talking millions and millions of years here, in in all that time a lot can happen to a species. It's possible for fish to breathe on land. There are examples of fish today that do that very thing for months at a time.
- That unintelligent natural processes are the cause of all the incredible complexity and design ["unintelligent design" movement] around us.
Absolutely. The species you see today have to be the kind that have adapted well to their environment. A better 'designed' wing on an insect for example, will give it an edge over an insect with a poorly 'designed' wing. It's more likely for the 'better designed' species to go on reproducing. Most species actually go extinct. 99% of all animals that have ever existed are now gone, in fact.
* Even those who claim to have merely "a lack of faith in God" if they are also to have any sort of overal thinking worldview must also adopt the above points.
No must about it. They can believe anything they want. Most people use rational thinking and look at the evidence however.