I think it is funny. Maybe to a super religious person it is offensive, but then again I think you should always be able to laugh at yourself and your beliefs.
Who put up that sign. Was it the church? If it was, that is my new church. I am not a very religious person, but if that church is nearby I am going to visit it just because of that sign.
I think the sign does show that you can have an idea of humor about everything and you do not have to be all serious all the time. Little jokes like this, whether you are serious or not, can just brighten the day.
This sign might actually be benefitial for the church. I know churches are not some store good or something that can be advertised in ads, but the sign does get your attention. It does draw in interest and that might actually bring in more people to the church. I think that it might really help get new church attendors.