I don't see this as "bigoted". It may be in poor taste, but it does reflect the belief of the Baptist church. They do have freedom to worship, and they also enjoy freedom of speech. We may not agree with them, but I will fight to the death their right to speak their belief. The same thing goes for putting anti-homosexual signs up in front of a church. When the government starts requiring churches to stop saying that homosexuality is a sin, they will be in for a very big revolution.
Actually, it is quite literally "Pre-judiced." The Baptist who believes that Catholics do not accept Christ as their savior believes a lie.