I define politics broadly.
a : the art or science of government
b : the art or science concerned with guiding or influencing governmental policy
c : the art or science concerned with winning and holding control over a government
: political actions, practices, or policies
a : political affairs or business; especially : competition between competing interest groups or individuals for power and leadership (as in a government)
b : political life especially as a principal activity or profession
c : political activities characterized by artful and often dishonest practices
: the political opinions or sympathies of a person
a : the total complex of relations between people living in society
b : relations or conduct in a particular area of experience especially as seen or dealt with from a political point of view <office politics> <ethnic politics>
I'd go with all of the above, including the ones under 5. Protesters against world poverty? Politics, in my book. Someone talking about christian values? Political. Someone talking about the right to privacy? Politics. Why do I define politics broadly? Because when stuff is part of a public debate that may (immediately or eventually) lead to collective or government action, laws, etc... it will become political (because that is about how society should be governed/ruled). I don't see discussions about racism, ethnicity etc. as being non-political, because all that is intricately linked to politics... and often those are at the center of the political stage, even.