Blasphemy is what some people find offensive. That's all. In all cases there will also be people, as this thread has already shown, who wonder what all the fuss is about, that is, why someone has taken offence at some words that do no-one any harm.
Which is why defining things people say as blasphemous is stupid.
Go ahead. Be offended. Big deal! What good does taking offence do to you or anyone else? None as far as I can see but, as I intimated earlier, taking offence can cause a lot of trouble. It isn't blasphemy or swearing or using words some people don't like that causes trouble. It's the taking offence at it and the sense some people have that they shouldn't have to hear anything they don't like. In a free society everyone will hear things they don't like at times. Mature people will just live with that, secure in the knowledge that if they want to say something they think is important but which some people might not like, then it's OK for them to speak up.