Rushdoony fused capitalism with Christianity to condemn socialism as theft.

Evidence

Rushdoony found it all very thrilling. He admired the publications that came out of Fifield’s groups and their allies. All they needed, he thought, was a little more theological sophistication and economic firepower. He was also strongly attracted to the libertarians, but in his view they could use a firmer grounding in theology. Extending on Fifield’s religion of the Eighth Commandment, Rushdoony began churning out doctrinal works arguing that “capitalism is supremely a product of Christianity.” On the other hand, “socialism is organized larceny; like inflation, it takes from the haves to give to the have-nots.” — Katherine Stewart, The Power Worshippers, 477