Who Did Islam Start With?
Please read verse 2:213 in the context as well. One nation is used in reference to the ideology of the mankind, which means religion in the greater context. As sister Afia mentioned, the sharia has changed. Sharia are simply laws derived from the principles of the underlying ideology suitable for people of a given time. Prophet Muhammad SAW being the last prophet, now the sharia we gave is intended for the rest of the time.