The Way Forward

It's also true that quoting scripture to suit the goals of government isn't what Jesus meant when he was the first to proclaim the separation of church and state:

In the Gospel of Mark the additional, provocative question is asked, "Should we pay or shouldn't we?"

Jesus first called the Pharisees & Herodians hypocrites for enjoying the benefits of Roman rule but not wanting to pay for those benefits. Jesus then asked one of them to produce a Roman coin that would be suitable for paying Caesar's tax. One of them showed him a Roman coin, and he asked them whose head and inscription were on it.
They answered, "Caesar's," and he responded:
"Render therefore unto Caesar the things which are Caesar's, and unto God the things that are God's".

Public schools are paid for by public taxes, and so by secular law are in the realm of the state; so Jesus would be against rendering unto the school the things that are God's. Rendering "unto God" is for religious people to do (say, reading the 10 Commandments) in their church lives, not force "things that are God's" upon the rest of the public or public schools as services of the state.

This scene is in at least two of the four New Testament Gospels.