@mark noble,
Hello Mark, The role of Satan (Iblis,Shaytan) is to bring evil and mischief into this world and to gather his army to go against God (Allah) and to go against the teachings from the 1 true God (Allah. God (Allah) does allow it, but 1 thing you have to keep in mind is this, that this "World Is A Test", The test has been waged on mankind for years and years, God allowed this Test to happen to see which soul Is pure and will submit him/herself to willingness of 1 God (Allah). We all get too caught up in this world thinking it will last forever, but to be honest it's flying by and for people who want everything in this world, remember you cannot take all belongings with you when you die, so if your a millionaire, you cannot take all that money, car, jewelry with you so it's best to concentrate on good deeds and keep on the right path and defiantly away from evil. As for your beliefs may be different from mine, I still respect you and you'r beliefs to please do not judge or criticize my perspective, please take a look at the teachings from the Qu'ran .
Almighty Allah also revealed: And surely, We created you (your father Adam) and then gave you shape (the noble shape of a human being), then We told the angels, "Prostrate to Adam'; and they prostrated, except Iblis, he refused to be of those who prostrate.
(Allah) said: 'What prevented you (0 Iblis) that you did not prostrate, when I commanded you?"
(Iblis) said: "I am better than him (Adam), You created me from fire, and him You created from clay."
(Allah) said: "0 Iblis, get down from this (Paradise), it is not for you to be arrogant here. Get out, for you are of those humiliated and disgraced." Surah 7: 11-13
Iblis's Vow for Evil
(Iblis) said: "Allow me respite till the Day they are raised up (i.e. The Day of Resurrection)."
(Allah) said: "You are of those allowed respite."
(Iblis) said: "Because You have sent me astray, surely I will sit in wait against them (human beings) on Your Straight Path. Then I will come to them from before them and behind them, from their right and from their left, and You will not find most of them as thankful ones (i.e. they will not be dutiful to You)."
(Allah) said (to Iblis): "Get out from this (Paradise) disgraced and expelled. Whoever of them (mankind) will follow you, then surely I will fill Hell with you all." Surah 7: 14-18