This song is pretty simple. For the most part of the song you can just play G and Em 
It starts off with an obvious acoustic guitar playing these.

          G              Em
e|-3-3-3-3-3-3-3-3-0-0-0-0-0-0-0-0-|
B|-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-|
G|-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-0-|
D|-0-0-0-0-0-0-0-0-2-2-2-2-2-2-2-2-|
A|-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-|
E|-3-3-3-3-3-3-3-3-0-0-0-0-0-0-0-0-|

The rest of the song, or atleast in some other parts of the song, it sounds like another 
may be playing a higher octave of these chords such as:

      G      Em
e|----7------7---|
B|----8------8---|
G|----7------9---|
D|----x------x---|
A|----x------x---|
E|----x------x---|

and as far as the organ/bells riff, on guitar it could be played as:

e|----------10----------------10--------------|
B|----10-12----12-10----10-12----12-10-12-----|
G|-------------------12-----------------------|
D|--------------------------------------------|
A|--------------------------------------------|
E|--------------------------------------------|

simple