From the fact that some post pictures of Jesus, as an argument for why this 14-year old boy should be held for a crime, it is clear they believe that it's just fine for government to enforce religious laws. That is no different than imposing Sharia Law. The only difference is that Sharia Law is someone else's religion and the Christian Bible is their religion.
It is also clear that any law that makes it a crime to "desecrate" a religious object, when that object was not harmed in any way, fails two constitutional tests. 1) First Amendment: "Congress [government] shall make no law respecting an establishment of religion..." This law establishes Christian law (the desecration of an image of Jesus) as a crime.
2) Rooted in the Fifth and Fourteenth Amendments, is the tenet of "unconstitutional vagueness." That is, a statute might be voided for vagueness when an average citizen cannot generally determine what is being regulated or what the law applies. If a statue of Jesus is covered under the law but burning a Koran is not or a non-religious statue is not, then the law is unconstitutionally vague.