To be a political Leftist is almost ubiquitous in the modern West.
This is not a matter of mainstream political discourse, which sees Liberal/ Socialist/ Labour/ Democrat parties as Left Wing and Libertarian/ Conservative/ Republican/ Fascist parties as Right Wing - because all of these are Left Wing in the deep sense that all are essentially secular, this-worldly and utilitarian.
All mainstream modern Western politics regards the main business and justification of politics to be to make mortal life happier or less full of suffering for many or most people - or, at least, for a favoured sector of the population.
This contrasts with the politics of the traditional religious past (with some significant degree of Original Participation) and the aimed-politics of the future (Final Participation) which takes a perspective of life beyond our mortal life, and regards divine destiny as the ultimate standard for judgement.
Thus, all modern politics is both Leftist (not religious) and also Positivist (because implicitly denying the importance and/ or reality of non-perceptual/ spiritual reality.
In sum Leftism is built-upon Positivist assumptions; therefore to be a Leftist is to be Positivist; therefore to be Leftist is to be anti-religious - and therefore anti-Christian - in your basic assumptions concerning the very nature of reality.
This has created a difficult and deadly problem of what Barfield termed RUP, the residuum of Unresolved Positivism in people who believe they are primarily spiritual. Leftism just-is a residue of postivism.
This means that in practice it can be seen that even people who aspire to a primarily spiritual and/ or religious life-perceptive are actually functioning within a worldly and utilitarian set of basic priorities.
Even when Leftists sincerely try to be religious and spiritual - they fail over the Long run; because their metaphysical assumptions are continually and continuously undermining their religious and spiritual aspirations.
In other words, spiritual and religious people are nearly-always in practice guilty of organising their beliefs and practices around socio-political priorities - which are of the mainstream type, hence Leftist.
And since Leftism is the water in which they swim, they are seldom even aware of the conflict within themselves - and respond by fitting everything-else around their unresolved, unacknowledged residual positivism...