No. Technically, we used to be a single celled organism. Your great great great great great times a lot grandfather was a fish. Eventually, we get humans.
Evolution isn't one of those things that you "believe in" or not, it's fact, proven without a doubt. If you don't "believe" in the fact of evolution, it's because you don't know enough about it. Here's a great video by Richard Dawkins, the authority of Evolutionary Biology. You could easily search for more on your own if you want.
I'm not sure why it's acceptable for evolution to be something that is acceptable to hear someone say that "believe" in it or don't. As is the belief that the Earth is
No, it isn't, most definitely not. The Earth also isn't flat.