If Allah is really the ..?(the Beneficent, the Merciful) why doesn't he wish that the "blasphemous"?

This Allah resorts to outright cursing? Yet in the Bible, God has to bear with Satan until the appointed time. Why can't Allah bear with Christians? At this point, one is forced to ask: who is this Allah that has to resort cursing those who believe that Jesus is the Son of God? Could he same God that spoke in the Bible? If the Bible and the Koran had same author, would they not definitely speak the same thing?