What are examples of satire involving education, court system, religion, and democracy in "To Kill a Mockingbird?"

First, it is important to understand what we mean by a satire. Satire is often likened to irony because it is meant to show abuses or shortcomings. 

In the educational system, we see the rules are ignored. Students should be in school but this is not really enforced. Many show up for a day or two and disappear.

In the judicial system, equality and fairness is seen as a farce because a many is wrongfully convicted just because he is a black man. This ties in with the idea of democracy because evben though Tom was entitled to a fair trial, he really did not get one and this system did not work for him.

In religion, where we are not supposed to judge and all should be accepted, we see Jem and Scout unaccepted in a black church because they are white until they people realize their dad is helping Tom.