The point of blasphemy law is not to protect God or religious figures but civil peace.
In islamic law, you cannot insult others religious figures, even if they don't mean anything to the religion.
It's pretty complicated to compare a largely secularized space like most western country where religion don't mean anything with countries with different religions that coexist and where faith is the central part of everybody's life.
I don't see any difference with the
US law about blasphemy against the national flag, you can be jailed for this.