No, that's not the only way. As I said to quatona, if someone could produce reputable documents that would dispute any of the five points I made, that might be something to look at. However, as I said, even several non-Christians confirm the facts I listed. That's pretty embarrassing for your side of the debate.
Why would anyone write documents refuting what anonymous authors wrote about decades after Jesus died? It is a fact, outside of the anonymous gospels, there is very little written about Jesus from contemporary writers.
Judging from your response, you don't sound very informed about this subject. First, the bible is several books, not just one. They were not combined until around the second century. So what we have in the new testament is several independent sources all telling the same story. Also, as I have explained before, there are several non-Christians sources that confirm the same story that the apostles tell. There are thousands of copies of the new testament and even though they may differ slightly in things like misspellings and using "he" instead of "Jesus", an experienced new testament scholar can use these many different copies to accurately determine the content of the originals. There is a society that studies this very subject and they have estimated that we can reconstruct the originals to about 98% accuracy. The 2% left over does not affect any major doctrine. So the NT you read today, is the same as it was back then. So we have many sources inside and outside the Christian faith who testify to the gospel story. The only thing left is for you to choose to believe that Jesus resurrected or to choose to believe that Jesus did not resurrect. So there's no room here for a "lack of belief". So which have you chosen to believe?
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I have studied the work of multiple scholars and historians in regards to the NT. In fact, it is one of the reasons I am no longer a Christian.
So, what are these "many" sources outside the gospels that confirm the claims in the gospels?
It is true, the actual words in the NT are likely around 98% accurate from the originals, even though the originals are lost and we only have copies starting about 200 years after Jesus died. There is a huge difference between, determine the words have been copied close to accurate in the thousands of copies and determining whether the words have historical credibility.
You see, man can write anything he desires in stories and others can copy them down, but that doesn't give them historical credibility.
There is no credible NT historian, following the historical method, that will state the resurrection can be confirmed using this method. As a general rule, NT historians will state they can confirm the following as likely happening using the historical method in regards to Jesus:
-Jesus was a real historical figure
-Jesus was baptized
-Jesus had followers
-Jesus was crucified
Beyond that, their is not enough evidence outside the gospels or even in being able to confirm the gospels as credible, to go any further.