If you do not believe in God, or Judgement day, then how can you possibly be 'offended'?
Liberals cannot tolerate anything that disagrees with their fragile viewpoint. And the reason is simple. Even they do not truely believe what they claim to believe. They all, deep down, know that they are wrong. That is why they cannot tolerate any dissent from their dogma.
If a group are children decide they are going to 'play house', then they all have to play. If one kid breaks character and says, 'This is stupid.', he ruins it for everyone. That why all Liberals have to be in 'lock step' and anyone who refuses to play along, gets kicked out of the club.