The earth’s magnetic field was discovered long before 1958. The Van Allen radiation belts were confirmed by satellite experiments in 1958. They contain charged ions from solar wind. This would of course be vastly different from Ezekiel’s vision of God’s throne seated upon the raqia, which is glass.
Astronauts have traveled through the VA belts for lunar expeditions.
As for the conspiracy theories…well, any time you deny the validity of the conspiracy, the theorist assumes that you are a member of the conspiracy. A conspiracy theory is a 100% self-referential system that uses highly elaborate, ad hoc mechanisms to explain away any and all evidence. How is one to make progress? Perhaps you could ask the theorist what kind of evidence would convince him/her that the conspiracy is not real, and see where that leads.