They don't "spend their lives killing and torturing men, women and children." Again, you need to pay closer attention to the context, which I and others have provided numerous times.I don't beleave these two men who spend thier lives killing and torturing men, women and children will ever do what only christ has done.
Rev 11:3 And I will grant authority to my two witnesses, and they will prophesy for 1,260 days, clothed in sackcloth.”
Rev 11:4 These are the two olive trees and the two lampstands that stand before the Lord of the earth.
Rev 11:5 And if anyone would harm them, fire pours from their mouth and consumes their foes. If anyone would harm them, this is how he is doomed to be killed.
Rev 11:6 They have the power to shut the sky, that no rain may fall during the days of their prophesying, and they have power over the waters to turn them into blood and to strike the earth with every kind of plague, as often as they desire.
Rev 11:7 And when they have finished their testimony, the beast that rises from the bottomless pit will make war on them and conquer them and kill them,
Rev 11:8 and their dead bodies will lie in the street of the great city that symbolically is called Sodom and Egypt, where their Lord was crucified.
Rev 11:9 For three and a half days some from the peoples and tribes and languages and nations will gaze at their dead bodies and refuse to let them be placed in a tomb,
Rev 11:10 and those who dwell on the earth will rejoice over them and make merry and exchange presents, because these two prophets had been a torment to those who dwell on the earth.
Rev 11:11 But after the three and a half days a breath of life from God entered them, and they stood up on their feet, and great fear fell on those who saw them.
Rev 11:12 Then they heard a loud voice from heaven saying to them, “Come up here!” And they went up to heaven in a cloud, and their enemies watched them.
Rev 11:13 And at that hour there was a great earthquake, and a tenth of the city fell. Seven thousand people were killed in the earthquake, and the rest were terrified and gave glory to the God of heaven. (ESV)
The two witnesses are God's prophets, who spend their days witnessing and prophesying (likely about the truths of Christ).
If you want to use something like Strong's make sure you know how to use it properly. That word is not only translated as "heaven" 218 times, it is also translated as "heavens" 24 times, "sky" 22 times, "air" 9 times, and "heavenly" once. You just can't go about using what ever definition fits, especially since you completely ignore the context of verse 13, where people "gave glory to the God of heaven." Yes, "heaven" there is the same word, ouranos. Do you believe that we should refer to God as the God of the sky or the God of heaven?They ascended into heaven.
Ouranoj strongs #G3772-The sky.
They ascended into the sky in a cloud.
They went up to heaven, where the God of heaven is, where the voice told them to come after God raised them from the dead with a breath of life. You are reading far too much into the text that isn't there.