A Christian School most likely is tax exempt if affiliated with a Church, but if in doubt, ask them.
Can we deduct K and PreK schooling cost and summer camp cost?
Deduction - No.
Credit - Maybe. The costs of Pre-k and summer day camp may be eligible for the child and dependent care credit. Kindergarten costs are not.
A very few states allow a deduction on the state return for Kindergarten costs. If yours is one, it will be asked in the state interview.