I used to feel that way too. Until a private Islamic school opened up in my state and the students received vouchers to go there. Use my tax money for an Islamic school? No way. Parents want to send their kid to private religious schools let them pay for it.
And also pay taxes from which they aren’t benefiting? So long as they teach the 4 R’s, Reading, Writing, ‘rithmatic and Reasoning, they can teach whatever else they want besides. When they become teenagers, they can rebel against any indoctrination anyway.