"Where is there any evidence that Heinrichs converted to Islam?"
Well, as
Patrick Briley pointed out, "During the time he was unaccounted for at OU, was Hinrichs being recruited, indoctrinated and taught about explosives by Islamic terrorists in US or foreign training camps? When he returned to OU in spring 2005 Hinrichs suddenly took on Pakistani Fazal M. Cheema and other Islamic students as his roommates, started visiting the OU mosque, and grew a full beard, the symbol of new Islamic convert."
So:
o Walks like a muslim
o Talks like a muslim
o Looks like a muslim
o Consorts with muslims
o Rooms with muslims
o Socializes with muslims
And, finally,
o Blows himself up like a muslim, at a major public gathering and using tried-and-true muslim explosives (complete with crowd-killing embedded projectiles).
If he wasn't a muslim, he certainly deserves honorary membership in the Religion of Peace.