If we were talking about something being the final word of God... hypothetically, of course...
Bahaism is much more likely to be this than any of the main three Abrahamic religions... Islam doesn't in the slightest suggest that Krishna and Buddha and Confucius and Socrates were prophets of God. Any interpretation of scripture to suggest this is the case is blatant misrepresentation of what's actually written in the Qu'ran.
Aside from this. Confucius wasn't teaching a religion but a mostly atheistic philosophy... The same could be argued of Buddha. If you read the earliest Buddhist texts, and research things like Anatta (no soul doctrine) from early teachings... Buddhism is basically a philosophy, only in a slightly less dialectical sense than western philosophy.
Now stop talking nonsense and prove that Islam is the final word of God. Please.