I like it when I hear philosophy in rap songs (or any kind of music, really) that I can actually fully agree with:

I never had belief in Christ, cus in the pictures he was white

Same color as the judge that gave my hood repeated life

Sentences for little shit, church I wasn't feeling it

Why the preacher tell us everything gon be alright?

Knew what it was for, still I felt that it was wrong

Till I heard Chef call himself God in the song

And it all made sense, cus you can't do shit

But look inside the mirror once it all goes wrong

You fix your own problems, tame your own conscience

All that holy water shit is nothing short of nonsense

Not denying Christ, I'm just denying niggas options

Cus prayer never moved my Grandmama out of Compton

I prayed for my cousin, but them niggas still shot him

Invest in a gun, cause them niggas still got them

And won't shit stop em from popping you in broad day

Hope that choir pew bulletproof or you gon' pay

-- Vince Staples, "Versace Rap"