in democracy anyone regardless of race or religion can stand for election for positions of power over others,
Well, no, not necessarily. That's a modern, Western-style "liberal democracy" you're speaking of, but democracy, without any qualifiers or modifiers, simply means majority rule, not necessarily with any protections for minority rights. The term "democracy" comes from the ancient Greeks who did not allow women, slaves/servants, non-propertied males, or anyone else who wasn't considered a full citizen of the city-state, to vote.
in democracy decisions are decided by a majority vote/consensus, not based on allah or his messengers individual prerogative.
Again, not strictly correct. In a constitutional form of democracy, the majority vote is limited by the parameters set by the constitution. Political Islam, in a sense, is a constitutional democracy, just not a liberal one, in that male Muslims are able to rule by majority provided they do not override the constitution (that being Mo's/Allah's rules).