Islam and Judaism is blasphemous according to Chrisianity as according they don't accept Christ to be the God
Christianity is blasphemous according to Islam as it claims that a human is a God
Hinduism, Buddhism, other pagans are blasphemous according to all Abrahamic religions as they break all the first 3 commandments
Atheists and Agnostics are blasphemers according to every religion.
So, if blasphemy laws are really implemented, then every single human being living and ever lived are blaspehemers according to one or other religion.