By whom?
Do we not fund public indoctrination now? Why not fund all educational institutions then? Private schools a well as homeschools. Heck, they're actually teaching their kids. Why not buy the better product as long as we're forced to pay?
You libertarians are so concerned about religion in schools, you'll allow thousands of indoctrinated robots to go through the failing system every year to prevent it.
What are the kids learning in public schools?
The liberal agenda includes world government (which will tolerate little to no U.S. interference), a world military (which will enter the U.S. at whim to quell a disturbance), a world court (which will impose law without U.S. Constitutional protections), world taxes (which will seize our money to redistribute to Third-World countries), and a world religion (Gaia be praised).
You'd rather fight school choice now because someone might pray, and allow this scrurge of America to grow. If you want a better government, why allow these kids to be trained for the next generation of voters when even the parents themselves don't want it? Is this the kind of government you want?
It's what the libertarianism fight against immediate school choice is allowing to happen.
You should be screaming for school choice any way you can get it! Iron out the little details later!