By “sufficient evidence”, I mean evidence that is of sufficient quality to show that the claim being made is probably true.
If you’re asking what that would be for a god, it would depend how that god is defined. Although it’s hard to determine
exactly what would qualify as sufficient evidence to justify belief in something, I can list several things that would be sufficient evidence and would not be sufficient evidence. For instance, you’d probably find it difficult to determine exactly what evidence would convince you that extra-terrestrials are abducting people, especially considering that there are many honest first hand accounts of these. Since I don’t want to spend all day telling you everything that I think would, and everything that would not, be sufficient evidence to justify belief in a god, I’ll direct you to
a thread that I started that is related to this, and I’ll list a few things that would convince me that there is a god that I pulled from the following site:
ebonmusings.org/atheism/theistguide.html
A rigorous methodology must be used to verify these things, or else they wouldn’t count:
-Verified, specific prophesies that could not have been contrived and could not have been a self-fulfilling prophesy.
-Scientific knowledge in a holy book that couldn’t have been known at that time.
-occurrence that were obviously miraculous, that were obviously the action of a particular god.
-A direct manifestation of the divine that I witness (which wouldn’t apply if there was any reasonable possibility that I was in a highly emotional state, or hallucinating).