Scripture does not say Satan tried to kill Jesus.Scripture says Herod tried to kill Jesus.
Why cant you simply believe what is written?Is there something forbidding you from believing the testimony of Mathew?
16 Then Herod, when he saw that he was mocked of the wise men, was exceeding wroth, and sent forth, and slew all the children that were in Bethlehem, and in all the coasts thereof, from two years old and under, according to the time which he had diligently inquired of the wise men.
17 Then was fulfilled that which was spoken by Jeremiah the prophet, saying,
18 In Rama was there a voice heard, lamentation, and weeping, and great mourning, Rachel weeping for her children, and would not be comforted, because they are not.
These are facts.In a vision,Herod could appear as a seven headed beast.But the above verses are actual events showing who tried to kill Jesus.