Is Jonathan Krohn Jewish?

No and yes. According to the Times, the young (former) conservative is being brought up as a Christian. So no, definitely Jonathan Krohn is not Jewish by religion.

Update: At 17, Krohn was doing teshuvah - repenting his conservatism - i.e., he adopted liberal ideas and went to study philosophy at NYU. MSNBC reported in the video clip below, wherein Lawrence O'Donnell lauded him for converting to the "bright side".

Update 2: The Times reported on Krohn: "The Growing Pains of Jonathan Krohn" (4/28/2013)

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As to his religion, according to the Times, Jonathan Krohn's mother was Jewish before she converted to Christianity. According to Jewish law, Jonathan is a Jew. Appropriately, the Times is silent on the issue of whether his Baptist parents gave him a bris. It seems the young Christian conservative did not have a bar mitzvah but he did get a present,

He received a computer from his maternal grandfather for his 13th birthday. “In the Jewish culture in which my mom was raised, 13 is a big deal,” he said. “But since I’m a Jewish Christian, I don’t do a bar mitzvah.” (Decades ago, his mother became a Baptist.)

Even in parentheses, the fact that the boy has a Jewish mother, makes him a (latent) member of the tribe. In 2009 we said: We do envy this young man who has concluded at such an early age that the world is precisely the way it should be, that progress is not needed, that government ought to be curtailed and that Rush Limbaugh is NOT a big fat idiot. We wish we had learned all that by the time we were 14. Even now we are struggling to rid ourselves of the desire for progress and the esteem with which we hold those who dedicate their lives to public service in the quest for better government and leadership in our country. //reposted from 3/8/09 because this little feller is finally talking a bit of sense//