Wrong, the claim of the resurrection can be found outside the Bible as well. The claim is the resurrection.
The claim that Harry Potter flies on a broomstick can be found in "Harry Potter and the Philosophers' Stone" but it is not only found there, it is found in Companion Books: http://hpcompanion.com/chapterbychapter/
Not only that, but there have been reviews by many trusted and independent writers in newspapers and critics on TV!
"The claim of flying on broomsticks can be found outside "Harry Potter and the Philosophers' Stone" as well. The claim is flying on broomsticks."
Now, I hope you see that your argument fails. You have swallowed the Bible, hook, line and sinker. You believe, in the first place, that the Bible is true. For anyone else looking at it, it would need some proof that it is true.
First you will be able to explain why the Gospel of Mark - the original gospel that the others copied - has no mention of the resurrection.
Next, the sources that you will quote are not reliable. You will find that in all cases, the writer is reporting what someone else told him - none of the writers saw Jesus and none of them witnessed any miracles and none of them saw a man who had come back from the dead. All reports were written after Christ's alleged crucifixion.
The main writers around at the time, were numerous. There was trouble in Jerusalem and many writers went there but despite a man who could control storms, walk on water, cured the deaf, blind and lame and feed 9000 people with loves and fish, and despite the allegation that when he died (temporarily) the sky went dark, and dead bodies rose from their graves and walked about, not one Roman or Jew saw fit to report these amazing happenings!
How likely is that?