Which side in Abbington v. Schempp promotes religion? Why would this side promote this essential feature of liberty?

The Abington School District promoted religion in their school, by compelling learners to participate in a Bible reading program. The US Supreme Court's decision directly addressed case of Abington V. Schempp where students were being forced to participate in school-sponsored religious activities. The Supreme court held that the school was violating the establishment clause by just having this Bible reading program, even if it was voluntary.

Explanation:

During that time under the Pennsylvania law, public schools were required to start the day reading at least ten verses from the Holy Bible. The Bible verses were to be read without comment, everyday during opening of each public school. However the establishment clause, prevents the government facilities from establishing a religion.