There are a lot of versions up on the site, but, sadly, most are incorrect. Here
are the real chords (of course, Sufjan changes it up with interesting pull-offs
and hammer-ons with his banjo, but just toy with it and you can get it)

Tuning - Standard

Capo - 8

Chords used - Em C G D

Verse 1:

Em (022000@1)              C (x32010@1)       G (320003@1)               D (xx0232@1)  Em (022000@1)             CI (x32010@1)have called you children, I have called you son. What is there to answer if 
G (320003@1)          D (xx0232@1)  Em (022000@1)             C (x32010@1)        G (320003@1)              D (xx0232@1)    Em (022000@1)                   
I'm the only one? Morning comes in paradise - morning comes in light. Still I 
      C (x32010@1)          G (320003@1)    Dmust (xx0232@1)obey, still I must invite.
           Em (022000@1)        C (x32010@1)             G (320003@1)         D (xx0232@1)            Em (022000@1)         
If there's anything to say, if there's anything to do. If there's any other 
C (x32010@1)         G (320003@1)          Dway, (xx0232@1)I'd do anything for you.

And that's it. It's 100% accurate - or, at least, as accurate as can be expected
when transcribing it from banjo to guitar. Have fun with the pull-offs and hammer-
ons. If you've listened to any of Sufjan's other stuff, you'll know what to do. Enjoy.

-Mike