This is all dependent on whose definition of "Christian" you want to use, and whose definition of "socialism" as well.
Not at all. Definitions are definitions.
At least according to the Bible, Jesus never sought laws taking from one by force and giving to others (taxation).
Socialists, on the other hand, advocate nothing but.
Then there are those "Christians", the ones I mentioned and a whole lot more, who do believe in using the power of the state to attempt to rectify social problems whether any individual likes it or not.