Oddly enough atheists have found a strange bedfellow in opposing this measure, though abet for very different reasons.
Republican Rep. Valarie Hodges, was supporting the bill until she found out that based on the limits set by the U.S. constitution they can't just support the religion they like, the voucher system has to be open to schools that promote other religions too...like Islam. She had this to say:
First off, not all of the founders were christian obviously to anyone knowledgeable of U.S. history, but mostly I just find it funny that they suddenly understand what atheists are objecting too with school vouchers when they realize that not everyone has the same religious beliefs they hold.“Unfortunately it will not be limited to the Founders’ religion,” Hodges said. “We need to insure that it does not open the door to fund radical Islam schools. There are a thousand Muslim schools that have sprung up recently. I do not support using public funds for teaching Islam anywhere here in Louisiana.”
Apparently she thought it was totally cool for the state to support schools supporting Christian schools who teach anti-science rhetoric and revisionist history.
At least there are suits ongoing to block this legislation.