did the 10 plagues of Egypt happen? did Elijah call down fire upon the priests of Baal?
Yes to both. That somehow means that Revelation 8:7 has to be interpreted literally as well? Were the accounts of the 10 plagues of Egypt or of Elijah calling down fire upon the priests of Baal written within highly symbolic books like the book of Revelation? No. You have to read scripture in context and in such a way that doesn't contradict other scripture.
Here is the text for the verse that was referenced:
Revelation 8:7 The first angel sounded, and there followed hail and fire mingled with blood, and they were cast upon the earth: and
the third part of trees was burnt up, and all green grass was burnt up.
Can you tell me why blood would be mixed with hail and fire if this is meant to be taken literally? Where would the blood come from and what purpose would it serve in this scenario?
Think about this, also. How is it possible that literally all green grass on the earth could be burned up but only a third of the trees? Aren't more than a third of the trees on earth near grass, which would mean the grass near some trees would be burned up, but the trees near the grass would not be burned up somehow? Explain that if this is supposed to be taken literally.
Consider the third trumpet as another example. Is it supposed to taken literally?
Revelation 8:10 The third angel sounded his trumpet, and
a great star, blazing like a torch, fell from the sky on a third of the rivers and on the springs of water— 11 the name of the star is Wormwood.
A third of the waters turned bitter, and many people died from the waters that had become bitter.
How exactly could one star fall upon a third of all the many rivers and springs of water on the earth without destroying the earth itself? Imagine the sun, an average sized star, falling to the earth, for example.
Clearly, one star falling to the earth couldn't just affect the rivers and springs of water, but would affect the entire earth and would do a lot more than just poison a third of the rivers and springs of water on earth, so this has to be symbolic language here.