You can take it to a public or private school if they have a good reading program, math, arts or science program. Maybe you want to use it for a reading or math club. Maybe you want to take your child to learn some sports. Maybe you need tutors for your children. Many after-school programs are offered at churches and parochial schools, leading some to raise the issue of separation of church and state.
Legal difficulties arise any time public funds are going to religious institutions.
Many of these institutions do fine work, and parents voluntarily pay to have their children attend these programs. But problems arise when taxpayers are forced to give funds to . . . Constitutional safeguards would have to be in place. It's not the fact that it's held on property that belongs to a church. Fla. Maine and Vermont confine their programs to non-religious private schools.