this is slightly long but on topic.
one of my hermeneutics & new testament profs (yes i went to seminary) fielded a question about tattoos & piercings in class and he said a Christian should not get them as they would still have those in their glorified body in heaven (still don't see why that would be an issue) and used a text where the Christ showed his nail marks to a doubting disciple after his resurection as proof that your heavenly body is the same as your final earthly body, only eternal. so then someone brought up organ donation. he said absolutely not don't do it, using the same reasoning. at this point i was pretty pissed about the garbage he was teaching, not that i don't believe in God because i do but because he was taking a verse and ripping it out of context to back up his thought. i took his argument and ran with it and said i feel sorry for Christian's that die in fires as they will spend eternity looking like a neglected marshmellow over a camp fire and even further yet, the Christians that die in explosions that would have to have someone carry their exploded body parts all over heaven for them throughout eternity. i was asked to leave for the remainder of the lecture.
tl;dr cliffs: as a Christian i strongly believe that the religion argument used by some Christians is absolutely ridiculous.
sorry about you loss Matt, fellow organ donor
if you don't mind my asking, which branch of christianity was your seminary? also, did you ask him if Paul just carries his own head around or whatever? and what about all the 1st and 2nd century martyrs that got eaten by lions in the coliseum? are those guys just s.o.l.? it's kind of frightening to think that a seminary teacher, with a doctorate i presume, would be so trapped by such narrow tunnel vision.. and yet, i'm sure your experience is sadly not an isolated event.