One of the defining features of Existentialism is that who you are, what you are, is a product of the choices you make. You make yourself, define yourself. While this has some compatibility with Christian thought - Kierkegaard in particular made the effort - it has more often been a competitor philosophy to Christianity. At the superficial level that many have adopted it (as is true of most philosophies; we are seldom as thoughtful as we tell ourselves), I often thought reveling in the nonchristianness of it was rather the point for them.
It has been a powerful, influential, and fashionable philosophy among intellectuals these last mmm, 100 years or so. It is, however, about as opposite to wokeness and identity politics as one can get. Our choices no longer matter. The imagined choices of other people who look like you now matter much more. The only escape is in the denial of choice and agreeing to accept other people's choices instead. This will be hotly denied, but I don't think with any intellectual force.
As group identity is now the powerful, influential, and fashionable philosophy of the rising generation, I have to wonder which will win? Are our choices everything or nothing now? My prediction is that existentialism goes to the dustbin, a least for a while.