That wasn't the issue. The issue is whether the government can treat religious non-profits differently than other non-profits. Doing so was blatantly discriminatory.
If taxpayers don't want money on playground safety, then they and their elected representatives can choose not to spend it on any non=profit and only public schools or public playgrounds.
I agree with you on the law, but my point is presented from the perspective of the church, not the taxpayer.