Republic: a state in which supreme power is held by the people and their elected representatives, and which has an elected or nominated president rather than a monarch. Democracy: a system of government by the whole population or all the eligible members of a state, typically through elected representatives. Voting for elected officials makes us a democracy.
Not necessarily. If a majority’s desire is for something that comes into conflict with the constitution, it isn’t guaranteed to be changed. If a representative majority’s policy voted on directly conflicted with an amendment such as the first, are you saying the current system would allow for that policy to be implemented?