Maybe this will help the Mets...

[gt2590]

As reported by Deadspin and FoxSports, one child named Charlie had this question at Church on Sunday:

 

[Pine Tar]

What was written underneath that that was erased

 

[Topnotchsy]

What was written underneath that that was erased

Looks like he started with "why did you" on the second line and realized he would not have enough space...

 

[MrMet]

And how would this....help....the Mets?

 

[A_Pharis]

Just like most of the things you see online where kids write something funny, I don't think this is what was originally on the paper.
Even considering the age of the writer, I don't think parts of the middle line were written by the same hand.