Hearsay is not the same as first hand testimony. I am not speaking of hearsay i am referenceing first hand testimony of people that claim to have had a personal encounter with a god. The Bible, the Quran and other books of religious significance records that testimony as well as the testimony of those that could be said to be relaying hearsay. In a court of law, sometimes there is reason to ignore first hand testimony, other times there is not, but in any case first hand testimony remains evidence until it is proven false by other evidence. That does not mean that it is assumed to be true it is simply considered evidence that something may be the case not proof that it is. I know of no instance where first hand testimony has been thrown out just because it is not corroborated. It may not be considered persuasive by those judging the case but is not thrown out simply because no other source of evidence corroborates the first hand testimony. In any case of first hand testimony it is not possible to be 100% sure of the motives of the witness. But when multiple witnesses give similar but not identical testimony it is much more convincing and less likely that there is a large conspiracy to deceive as such an attempt by a group at mass deception is more likely to produce identical rehearsed testimony.
BTW In considering whether something is historical fact hearsay is definitely considered evidence.As I see it, if the testimony of first hand witnesses is considered evidence in a court of law, and it is, and if even hearsay is considered evidence in historical research, and it is, then saying there is no evidence of the existence of a god is objectively false.