Socialism is a direct consequence of Christianity. It’s the ultimate material incarnation of it.
Because of Christianity, we had the Renaissance, because of the Renaissance, we had capitalism. Because of capitalism we have socialism.
And many religions are extremely progressive and egalitarian. Many Hindu, Buddhist, Christian, Jewish and even Muslim sects are. Not to mention Sikhs and Jains etc.
The issue is mostly the hierarchical, patriarchal and authoritarian sects won out and dominated the rest, extinguishing most that were real threats to their domination.
In my mind, this is all religion by the way. Buddhism or capitalism. Trans-humanism or nihilism. It’s all religion. We just have a very limited and antagonistic view of religions nowadays.
To the Classical Greeks “religion” was just trying to understand the world and how to live in it for example. That’s how most of us saw religion for a long time. Until the Catholic Church basically.
Now the Catholic Church is evil as fuck… mostly. As an institution.