As a formally educated teacher with a BA in Education and a Master of Education, separation of church and state actually began with public education when the schools were removed from the control of local churches and made into public schools.
The Bible cannot be banned from public schools as long as it is in the school's library nor can an individual student be banned from carrying a personal Bible with him (or her) while in school. The ACLU will defend a student for that right to do so.
Prayers said by individual students in public schools cannot be banned either as long as they are not disruptive or an attempt to convict fellow classmates of assumed sin in their lives.
A T-shirt with words on it is NOT the Bible. What was on that shirt actually goes against what Jesus himself taught. The wearer was attempting to take the duty of the Holy Spirit and convict/condemn the school/school system of sin.
The best place for children to learn the teachings of Jesus the Christ is in their own homes. In fact, it is the primary responsiblity of a parent to give a child his religious education. The parents should not rely on a church or a public school to teach "Christainity" to their children.
Oh, ignorant people do equate homosexuality with alcoholism and drug addiction. IMO, I like to use the extreme here and say that comparing a sexual orientation with an addiction is like comparing apples with rocks.
I have been following the ex-gay movement since its beginnings in the 1970s. I have yet to meet a person who could prove God had changed his sexual orientation; but, I have certainly met a lot of people whom God healed through the power of the Holy Spirit and they never had a desrie to drink alcohol again, take drugs, or even use tobacco again.
Why my father did not use illegal drugs, when he got saved and filled with Baptism of the Holy Spirit, he was never tempted again to drink or smoke. And, another one of his bad behaviors was that he could not say one sentence without one or more cuss words in it before he got saved. The only time I ever heard him use any word that would be considered offensive was when he was quoting exactly what someone else said.