Still struggling.

[KevinM1]

Prophecies.  Heh.

It's really easy to fulfill prophecies when the people writing these stories are doing it at least 30 years after the events supposedly happened.

Here's the thing: the Bible is mostly fiction.  There could have been a dude named Jesus running around in the Middle East rabble rousing and whatnot.  And it's definitely likely that if such a guy existed that he was killed via crucifixion as a way for Rome to dissuade others from following his example.  Everything else?  Pretty clearly written to make this person sound fucking amazing.  Why?  Because religion and politics were one and the same back then, and there was a need for those who wanted to resist Rome to create something for others to rally around.  It's abundantly clear that the NT is written from the POV of a persecuted people (the OT is basically "Our clan is better than yours, so here's a bunch of rules to follow and a genealogy and 'rah rah, we're the chosen ones' stories to keep this clan strong").  

Seriously, compare the story of Jesus with a bunch of other messiahs that the world knew about before then.  The similarities are striking.

But, the biggest thing is to not get conned by emotional appeals.  Your brother said he 'researched' it.  Well, there's actual research, which means looking at academic sources and thinking critically, and then there's 'research' which usually means finding sources to confirm your bias so you feel good/eliminate doubt.  I'm willing to bet $100 that your brother did the second version.  That he had a crisis of faith, declared himself atheist because it was a way for him to exhibit typical, rebellious teenage tendencies, felt bad/guilty, then rushed to biased sources (perhaps provided by your mother or church) to reassure himself.  That's not research.

And now, your brother is trying to leverage his "I'm the older brother" cachet in order to bring you back into the fold.  It's typical theist BS.  They have no rational argument.  The prophecies stuff has been debunked many times before.  They're just trying to increase the pressure on you by doubling down on the guilt, fear, doubt, and notion of some kind of authority on you.

I mean, here's a very quick link that took 2 seconds of Googling to find: https://en.wikipedia.org/wiki/Jesus_and_...fulfilment  As you can see, biblical prophecy doesn't really mean what laypeople think it does.  And by following the cited sources, you should be able to figure more out on your own.  And I'm 99% sure this is more legit research than your brother attempted.