Identifying yourself with your beliefs seems like a surefire way to stop you from changing your mind on things you might be wrong about. I think it's better to identify with something arbitrary and static, like your heritage/nationality/ethnicity/family. Your roots. That way the identity-seeking part of you has a nice, firm rock to hold on to, and you can freely evict ideas and beliefs that aren't effectively predicting your experiences - without destroying your self-identity.

Belief-as-identity strikes me as really pernicious. It's a big problem people have with religions with orthodoxy like Christianity or Islam; these systems sustain themselves in part by training people to tie their sense of self to a particular belief about the nature of god/the universe.

Identifying as an Atheist, or Liberal, or a Conservative, or anything just lets that thing get its hooks into you. I'd like to be able to drop and change my political beliefs if it turns out I'm wrong about which form of economics leads to the greatest amount of human flourishing, for example. Each individual ideological meme, in contrast, really wants you to build it into your self-identity, to spread its roots so deep that to extricate it would be spiritual suicide. All beliefs 'want' this, and while it's impossible to not be a slave to some meta-meta-meme, you can at least not be a memetic zombie for some object-level one! If a belief stops paying rent in useful predictions, I want it evicted, out on the street!

Loyalty to people, not ideas.