Sources for Christian themes and motifs in Naruto?
I'd say that Kishimoto draws a lot from Christianity and other religions. It's not just similar stories by chance. The events you list from Naruto are almost the exact events that happened in the Bible. That's not just chance, nor is it surprising. Almost all elements and events in Naruto are influenced by outside forces. So, it's not surprising that the more supernatural seeming events would be influenced by religion.

I'd also like to add that, although Kishimoto hasn't went into full detail on all of the influences of Naruto, Christianity seems to be well known in Japan, considering it's influences in other anime and manga. The stories from the Bible are probably known by a large number of Japanese people. Especially the more important ones like the forbidden fruit, which has been referenced numerous times in other anime. 

Here are some interesting subtle influences of Christianity in Naruto:


Danzo Shimura originally went by the nickname Kanzo when originally meeting with the Akatsuki, which appears to be a nod to Kanzo Uchimura, a protestant and creator of the Nonchurch Movement. Kinda like a rebel among religious bodies at the time, who often got fired because of his beliefs and practices.
Mifune is based off Toshiro Mifune a famous Christian actor. (I'd link to it, but I don't have enough reputation for more than 2) 
Sasuke is not only similar to Judas, but Obito CALLED him Judas in the manga, just before he became the Jinchuriki of the Juubi. 


There's been evidence of Christianity's influence on Naruto before, but that latter example seems to act more as proof than evidence. 

I feel like many people downvoted this simply because they didn't want it to be true, but Naruto takes influences from Christianity, and that shouldn't be thought of a bad thing. The influence of Christianity can make for some really cool narration if it's not Americanized propaganda (because everything here appears to be nothing but propaganda of some kind). Take Final Fantasy 7 as an example of this fact.