It’s a basic syllogism.

1. Socialists are wrong about everything that really matters
2. All socialists are atheists.
3. Therefore G-d exists.

Number 1 is certainly right but not necessarily Number 2. Still the conclusion is right so perhaps it works in the reverse order as well.

1. G-d exists
2. All socialists are atheists.
3. Socialists are always wrong about everything that really matters

Not as good as the first one. My version of Pascal’s Wager.