Scientific explanations do not necessarily correspond with truth. There are many cases when a scientific theory is proved wrong or there are competing theories. Moreover, science can not investigate things that are beyond the scope of our senses or instruments to aid them. What science is is a method for investigating and drawing conclusions from observation. That's it. All it means is that observation supports our conclusions about the existence of something and its causal relations with others. So far this method has proven very useful for understanding the natural world and identifying the means to predict our desired outcomes. This doesn't mean that anything from scientific consensus is true, for all we know our senses could be deceiving us.
BW,
A number of stars have a habitable zone, hell even gas giants do (it's just further out). Earth just happens to be in the habitable zone of our star.
Yes there are a number of statistical improbabilities for a number of things concerning how life occurred on earth. But remember, the universe is big, and it is probable that life would happen somewhere in the universe. It may be rare for you to pick the black ball in a jar of 2000 white balls. But after 40000 tries, it's very probable you would pick the black ball at least once.
Moreover, there are a number of things science can't explain, like what happened before the big bang. This doesn't mean God did it. For all we know it was something natural that we haven't seen anything like. Rather than say God did it, it's best to suspend judgment. Saying God did it is a hasty conclusion.
Nai,
Evolution is strongly supported by empirical evidence. We have knowledge of micro evolution, where genes can mutate over some generations of a species (especially in bacteria), giving it new properties. If you have genes and they can change, then macro evolution is conceivable. Moreover, the fossil record supports macro evolution. Yes this doesn't mean evolution must have happened, but it's strongly supported even if we have missing fossil links. But yes, like every scientific theory, it is open to questioning and should not be believed with certainty.
Btw, I am saying that no scientific theory should be believed with absolute certainty. They all give the best conclusion with the evidence available.
Oh, and a theory in science is not like a theory in popular usage. In popular usage a theory is a speculation or hunch. In science, a theory is an explanation that has been experimentally tested and there is some justification to assent to it.