This is part of the problem, god lets the "devil" run wild and do his thing without restraint and without compunction. I 100% agree that the "devil" seeks out those who are weak and vulnerable, that makes the devil a coward.
If god is almighty why doesn't he just cast him off to hell, permanently? You probably seen this asked a million times? I did some reading, from what I gathered. "satan" is just a concept agreed on by many clergy, god's alter ego. Could it be that these are just 2 peas from the same pod? I like to think that there is a god looking out for me, protecting me from evil, but I think god does not have much tolerance for much of anything and it only seems to invite more opportunity to sin.
Please do not go off on those false traditions of men, like men's idea of Satan being some alter-ego of God's Divine Nature, or that Satan is equal in power to God's power. NONE of that is Biblical, and if you are listening to preachers that say it is so, then you are heeding charlatans and false prophets.
Biblically, Satan, the devil, was 'originally' created good, but then he rebelled in coveting God's Throne for himself, his wanting to be GOD. It was Lucifer's job as a 'covering cherub' to guard God's Throne originally, and God said Lucifer was originally 'perfect in his ways'. God gave this info about Lucifer in parable form in Ezekiel 28 using the "king of Tyrus" as a 'type' for the devil. The flesh king of Tyrus was not a covering cherub (a heavenly being), nor was the flesh king of Tyrus ever in God's Garden of Eden. But the devil was, and that's one of the ways to know God is actually pointing to Lucifer. (I use the devil's name Lucifer to refer back to the 'old world' when Lucifer was originally perfect in serving God at God's Throne. And then the devil's name Satan (means the Adversary) after he fell, and began working against God and His Christ with tempting Adam and Eve.)
False ancient religions like Zoroasterianism, treat the idea of good and evil as just opposites equal in power. The devil definitely is NOT equal in power to our Heavenly Father. Since Satan rebelled, God brought this present world to find out who wants to live with Him in His future new heavens and a new earth Eternity. That's what this present world is for, and that is why the devil is allowed to tempt us, IF... we allow it with trying to follow the world, or our own way.
As a matter of Biblical fact, God is USING Satan in this present world as a set of pruning shears. God even refers to Satan as the "rod of Mine anger" in Isaiah 10 (using "the Assyrian" as a type for the devil); it's in the sense of a punishing rod upon the wicked and rebellious. What does this ultimately mean in our lives today?
It means that IF...we try to follow this world (which is ordained to be destroyed), or our own way (which is the way of flesh, again of this world), then we will always fail. We may store up great wealth, friends and family, but all for nought, because our soul will still be empty without God's Presence in our lives. And we will have assigned ourselves to the "outer darkness" with the wicked when Lord Jesus Christ does return to reign in our near future.
But IF... we instead listen to our Heavenly Father and His Son, Who created all things, and believe on the Blood of Jesus Christ, God having come in the flesh to die on the cross to release us from the bondage of death which Satan originally caused, then we ask God to come in our lives, and direct us, guide and lead us to the proper way of life, for this present world time, and forever. It will then become a time when we will learn how to not... to rebel against the only True Way from GOD Himself, because the time is coming, when God is going to destroy this present world, and all the wicked, and especially Satan and death. In His future Eternity, there will no longer be any death or sin, and only those who wish to be a part of His future Eternity will be there.
Per Apostle Peter in 2 Peter 3, he said that God is long-suffering, not wishing that any should perish, but that all should come to repentance. That is what this present world is about. So IF... a person ALLOWS themselves to be tempted by the devil because of rebelling against GOD and His ways, then God allows it, and it is not God Who is causing that, so don't try and blame God, for that is the devil tempting you to think that. The matter is simple - listen to and follow God through His Son and you won't succumb to the temptations by the devil. It's about a 'choice' each soul must make. But rebel, and think to go your own way, and you invite the devil in, because God has ordained this present world in the hands of the devil, as the devil when trying to tempt Jesus in Luke 4, the devil offered Jesus all the kingdoms of this world if Jesus would instead follow him.