LITTLE ROCK, Ark (Reuters) – A coalition of atheists is accusing Little Rock’s city bus line of violating their rights to free speech in a fight to place ads on public buses praising a God-free lifestyle.

The Central Arkansas Coalition of Reason alleged in a lawsuit that the Central Arkansas Transit Authority and its advertising agency are discriminating against the group because they’re being required to pay tens of thousands of dollars to put $5,000 worth of ads on 18 buses.

The ads would read: “Are you good without God? Millions are.”

Other groups, including churches, have not been required to pay the fee, which amounts to $36,000 in insurance in case of an attack on the buses by angry Christians, according to the lawsuit.