Christianity (esp. Catholicism) and socialism have a long connection, especially in South America, which did not have the economic miracle Kerala did.
Kerala did not become wealthy from socialism, it became literate and land reform lifted many out of poverty. The actual wealth started accumulating when Keralites took advantage of opportunities to work abroad and send remittances home. That has been a major economic driver for the state and India as a whole, but they did it long before others did, largely because land reform gave people a safety net to fall back on so they could risk going abroad to earn more
Socialism maybe the but the Roman Catholic church has a strong history of opposition to communism.
I would suggest God's Bankers: A History of Money and Power at the Vatican as for a pop-culture introduction of how the Catholic church aligned itself with fascist states including Mussolini's PNF, the Nazis and the Ustaše.
The Ustaše were particularly closely associated with the Catholic church.
Kerala did not become wealthy from socialism, it became literate and land reform lifted many out of poverty. The actual wealth started accumulating when Keralites took advantage of opportunities to work abroad and send remittances home. That has been a major economic driver for the state and India as a whole, but they did it long before others did, largely because land reform gave people a safety net to fall back on so they could risk going abroad to earn more