Not what is being said at all. Look at just the moon aspect... if the moon had not collided with Earth, sending it into a wobbling rotation, the planet would not have seasons. The seasons are of fundamental importance to almost all plant life, it is how they pollinate and reproduce. Other animals depend on plant life and couldn't' exist without it. If the moon had been larger or smaller, or struck the planet differently, the wobble and seasons would be much different. But the moon happened to be the perfect size and began orbiting Earth as a satellite, exerting not too much or too little gravitational counterforce, to create oceanic tides. Without the tides, many life forms in the sea could not exist, this is how they time reproduction. Had the moon been larger or came to orbit more closely, the tides would be massive and there would be little dry land. Further out, and lack of tide would have caused the oceans to stagnate.
Any reasonable or objective analysis, has to conclude life on Earth would not be the same without the moon, and may not even exist at all. I'm sure some smarty will weigh in on this, and disagree, but no reasonable person can think life would be anything like we know it to be, if we didn't have seasons and tides naturally instructing life's process.
Another thing to look at is our amazing atmosphere. While science geeks can explain how it works and how the atmosphere formed, they can't explain why we were so freaking lucky. You see, it just so happens, the elemental layers of the atmosphere protect all living things from deadly radiation and ultraviolet rays. Without the atmosphere, life could not exist on Earth.
Finally, because of our proximity to the sun, and large vast oceans, convection currents are formed, which enables millions of other life forms, and again, provides vital reproductive elements that would not exist otherwise. Combine all of the things I've mentioned, and you get our climate. While there are certainly extremes, our climate compared to that of other planets, is quite stable. The most fascinating thing is, if we didn't have evaporation or rain, which is caused by the aforementioned anomalies, life could not survive.
What we see is a concerted effort on part of nature, to make life possible on Earth. Some think this 'just so happens' to be the case, I believe it's too much coincidence to dismiss.