Gravity is a physical reality but socialism is a philosophy. A human invention. Christ might have had ideas in common with modern socialism, but he also had ideas in common with a lot of other modern philosophies too. The point is, he simply cannot have been a socialist, because socialism as a concept didn’t exist and we can’t ask him now if he would agree with the label. Socialism isn’t just “doing stuff for people” and I don’t think Jesus opined a lot on the ownership of the means of production or the inherent value of labour