If this is similar to a mission trip I would disagree with Opus. It might be deductible if it was for you, but not for your child. Contributions
to a Church to support a child's mission trip are not charitable contributions.
See U.S. Supreme Court, Davis v. United States, 495 U.S. 472 (1990) (at http://supreme.justia.com/us/495/472/ ).
Also,
from IRS Publication 526 on charitable contributions:
"You
cannot deduct contributions to specific individuals, including the following. .
. .
Expenses
you paid for another person who provided services to a qualified organization.
Example. Your child does missionary work. You pay his/her expenses. You cannot
claim a deduction for your son's unreimbursed expenses related to his/her
contribution of services."
