There is an extremely fundamental method employed most often by humans to convey a truth, but without human's own awareness about the existence of such a method.
Since it is the most efficient and most employed method to convey a general truth, if God does exist He should use it to convey His message intended for humans.
And the Christian God employed such a method explicitly to convey the intended message for humans.
1) humans employ a methodology called human witnessing to convey almost each and every claimed truth, but humans they themselves don't realize so
2) God explicitly employed human witnessing (in a valid way) to convey His message of salvation among humans.
In order to reach a truth, humans have to rely on a very small group of humans as the first line witnesses who maintain a direct contact with the truth itself. All other humans choose to believe/or not about what is said by this small group of humans to reach a truth. Almost each and every single piece of truth is reached by humans this way.
To name a few,
You won't acquire direct evidence of the existence of the black holes (or any scientific truth in general). You rely on the scientists (a small group of humans) to work it out for you to believe. You believe the existence of black hole because the multiple accounts of scientific writings said so.
You don't acquire any evidence regarding to the missing Boeing 777, you rely on the multiple accounts of media to reach such a truth. The media is made up of a small group of humans called the reporters/editors/writers.
It is almost impossible for you to acquire any evidence in the distant history of any human nations. You have to rely purely on human witnessing to reach the truth of a specific historical event or figure. You have to believe what is said by a small group of humans regarded as the historians to reach any truth. More likely, if multiple accounts of historians saying the same thing, it's more credible to believe.
In any case, you don't examine any evidence, you just choose to believe what is said by the small group of humans professed in determine the truth. Almost all human knowledge are conveyed this way, that is, through human witnessing. :yes:
If a God exists and He would like His messages to be conveyed among humans, not only He should be able to use this approach, but also He should be able to explicitly name this approach. Humans themselves failed to realize this approach explicitly.
Now among all those religions out there, only the Christian God is capable of doing so. The Bible is explicitly said to be formed by witnessing. Prophets are regarded as God's witnesses. No other human books can explicit apply this concept as the Bible does. The concept of multiple accounts is used explicitly plus that martyrdom is used to validate the human witnessing.
Isaiah 6:9
Hear ye indeed, but understand not; and see ye indeed, but perceive not.