Is evolution blasphemy against God

Absolutely not. Or, at least, it is not intended to be blasphemous. It is, however, very well possible that those who have a heartfelt belief in Creation perceive it as blashemous.

Answer:

The answer depends upon both the one presenting the theory of evolution, as well as the one hearing it.

a) If the presenter makes no implication of non-existence of God, that would be one thing. But if he/she insinuates that evolution happened and took place by itself with no push or guidance or anything, certainly that is blasphemous at least by implication.

b) If the listener accepts the view that evolution happened or could have happened through the agency of God, the listener would likely not see certain presentations of evolution as blasphemous. But if the listener believes in recent Creation, and/or in direct Creation of the species, most if not all presentations of evolution would be unacceptable or blasphemous.