Yes, the most significant political fault line is between the statist individualism and communitarianism, because these are the two juxtaposed political positions that most politics can be boiled down to. Ultimately, politics is a decision of how valuable the individual is, and how many rights they should have, in relation to the collective rights of the rest. This is the largest fault because this is what all politics comes down to.
Talking heads can argue over political theory, from statist individualism to communitarianism, all they like, but the political divide is much simpler and deeper than any theories. Only the few rich elite really care about their actual politics; the largest line is due to the distribution of wealth. That line, however, is also segregated according to religious beliefs, which the parties use to further their agendas.