The bacteria's tail motor has over 40 parts in it. Now if your saying that life originated from a single cell organism then how did it get the tail? Natural selection says that a species changes by small changes. If natural selection does occur then it would only get 1 or 2 parts. But that wouldn't do much good. even if it got the tail. Because it needs all 40 to work. But with out it next it would dissapear because it inhibits movement.
Another argument from an irreducibly complex system. This one seems to be making the rounds lately. You might ask yourself if you think that bacteria have always had this particular flagella, what proof do you have that the flagella has always been arranged in this particular way? You can't know, flagella are not fossilized so we have no history of them. Now, take the example of your middle ear. There are three bones lined up in a precise arrangement so that if any of those bones are out of place you will be deaf. Evolutionary theory states that mammals are descendents of reptiles. Reptiles only have one bone in their middle ear. So, since middle ear bones fossilize there should be a record of the transition between reptiles with one middle ear bone and mammals with three middle ear bones. Lo and behold, we do have those transitional fossils. You can reference these fossils
here (jumps to another topic on this site, trying to keep bandwidth down).
So, is it fair for you to demand a specific evolutionary pathway for the flagella which doesn't fossilize when pathways that do fossilize seem to be strongly evolutionary in nature? You will also notice that the ages for each fossil are given and they are placed in descending order chronologically from top to bottom. Another interesting fact is that during human embrylogical development, jawbones in the fetus move up and become middle ear bones, just as is seen with the fossil record.