Article 156a
By a maximum imprisonment of five years shall be punished any person who deliberately in public gives expression to feelings or commits an act,
a. which principally have the character of being at enimity with, abusing or staining a religion, adhered to in Indonesia;
b. with the intention to prevent a person to adhere to any religion based on the belief of the almighty God.

It was made so that the minority would be protected against the majority, those that are christian, hindu, buddhist and other rural religions are protected against the evergrowing majority, and vice versa. I believe it was made so that no one should slander another one's religion. However, it seems that the Majority has used this article as a shield and a reason to take down minorities, nowadays minorities are taking the fight back.

It's sad really, that a lot of the people are swayed by emotional pressure and even more..