The theory of evolution only makes sense after whatever occurred to make the Universe a reality happened. It isn't scientific fact that all life on earth came from a single celled organism.

The theory of evolution only applies (as far as I can see) once you already have the different genus'. Interspecies evolution is perfectly believable and I would agree that it has pretty much been proven scientifically but to me, believing that everything we see on earth originated from a single source that just appeared out of nowhere as Darwin seemed to suggest requires as much faith as believing that some sort of god or creator was responsible. Nobody knows yet you ask most school children and they will say they 'know' based on what they were taught in school.

Both evolution and the idea that a god or creator was responsible should both be taught as being a possibility. This isn't happening now in my opinion.