The strumming throughout the song is done like this:
-------------- | -------------- | -------------- | -------------- |
--2-----2----- | --2-----2----- | --2-----2----- | --2-----2----- |
--2-----2----- | --2-----2----- | -------------- | -------------- |
--2-----2----- | --2-----2----- | --2-----2----- | --2-----2----- |
-------------- | -------------- | -------------- | -------------- |
-------------- | -------------- | -------------- | -------------- |
       ^     ^          ^     ^          ^     ^          ^     ^
Intro:
A  A7  D  Bm  E  A

Ch-k-ch, huh huh
Ch-k-ch, huh huh
Ch-k-ch, huh huh
Ch-ch, huh
Huh,huh, ch-k-ch, huh huh huh huh

Steve:
A
No matter what they tell us
A                   D
No matter what they do
Bm                  E
No matter what they teach us
                        A
What we believe is true
 

Ronan:
A
No matter how they call us
A               D
However they attack
Bm                   E
No matter where they take us
                        A
We'll find our own way back

Steve:
A                 A7
I can't deny what I believe
D
I can't be what I'm not
Bm                      E
I'll know our love forever
E               A
I know no matter what

Ronan:
A
If only tears were laughter
A                 D
If only night was day
Bm                      E
If only prayers were answered
                        A
Then we would hear God say

Steve:
A
No matter what they tell you
A                   D
No matter what they do
Bm                        E
No matter what they teach you
                     A
What you believe is true

Ro&St:
A                       A7
And I will keep you safe and strong
D
And sheltered from the storm
Bm                      E
No matter where it's barren
                  A
A dream is being born

C            F
Ooh ooh ooh ooh

Ronan:
C
No matter who they follow
C                       F
No matter where they lead
Dm                      G
Now matter how they judge us
                        C
I'll be everyone you need

        C                       C7
Steve: No matter the sun don't shine
(Ronan: The sun don't shine)
        F
Steve: Or if the skies are blue
(Ronan: Skies are blue)
        Dm                 G
Steve: No matter what the ending
                    C
My life began with you

        C                       C7
Steve: I can't deny what I believe
(Ronan: What I believe)
        F
Steve: I can't be what I'm not
(Ronan: I know, I know)
        Dm                  G
Steve: I know this love's forever
                        C
That's all that matters now, no matter what

No, no matter
(Ronan: No, no matter what) no
[repeat twice]

No, no matter (no, no matter)
That's all that matters to me
(Ronan: No, no matter what)
[Repeat thrice]

No, no matter (what)
That's all that matters to me
(Ronan: No, no matter what) no
[repeat twice]

No, no matter (what)