Using the GP's figure of 65 years ago, you could check out Elron's claims. Scientology was founded in 1952. Dianetics was going crazy for a few years before that.
Other than that we need to find some MACHOs between ~700 and ~1800 lightyears away in order to check the claims of the more popular religions.
But, considering the data would be coming from the scientific (and in particular the atrophysics) community, it would be ignored by those who found it inconvenient.
Religion and Astronomy have a very checkered past.
That would help a lot of people with their beliefs!