Is a bicycle faster than a motorbike, no, except maybe on a very short course or if the motorbike driver is very very bad and the cyclist if very very good.

Or in a densely populated urban enviornment. Bicycles can often beat motorbikes in innercity enviornments. Chucking your motorbike over a fence, or lugging it up a flight of stairs is a little more difficult than with a bicycle. :-) Hence the prevalence of bicycle couriers in business intensive cities.