There have been quite a few cases of Christians being harassed by police when they publicly proclaim messages against abortion, homosexuality etc. See e.g. here. One hopes that police nationwide will be a bit less likely to do that after a recent case in Ohio upheld the right of anti-abortion campaigners to display images of aborted babies:
" Today, a three-judge panel of the U.S. Court of Appeals for the Sixth Circuit in Cincinnati, Ohio, unanimously ruled that a three-hour police detention of law-abiding, pro-life demonstrators presented valid constitutional claims under the First and Fourth Amendments. The Court reversed a lower court's decision in favor of the law enforcement officers.
Robert Muise, the Thomas More Law Center Trial Counsel handling the case, successfully argued that the lengthy detention - so that the FBI could "gather intelligence" on the pro-life demonstrators - violated the demonstrators' Fourth Amendment right to be free from unreasonable police searches and seizures. He further succeeded in showing that the police violated the demonstrators' First Amendment rights by targeting them for disfavored treatment because they were "anti-abortion."