God is kind, loving and merciful. Devil is bitter, full of deception, vindictive & evil.
GOD:
From my understanding of God, he is the creator who loves his creations and is constantly creating. He is a good, principled, loving, caring and bringer of Joy & happiness. If he takes control over your life you will experience & exhibit most of this characteristics.
dEVIL:
Devil hates creations. He currently rules over our planet. Read Jobs's temptations in the Bible to understand why God allows the devil to rule over humanity — He already made promises to the devil (as a principled God he wouldn't back out of his promises).
Devil is very deceptive, full of lies (Google: "how the Bible describes Devil"), he could tempt you with all kinds of Worldly gifts in exchange for your services and Worships of him.
He possess the weak to raise his army of evil doers, the haters of the good, the destroyers, the bitter minds and lawless people. If he possess you, you have a build up of unexplainable anger in you. The anger can get you depressed if it does not "release on someone or something". Devil makes you blame everyone else for your problem.
He could pretend to be God or anything he chooses to in other to decieve people but this pretense never last — example: he could tell you he is the messiah, the next day or year he is acting opposite of what true Messiah represents . Gradually, he will begin to show his true nature like being evil, blood thirsty, destructive, deceptive, a liar, judgmental, lawless, unprincipled, arrogant, unjust and hateful.
There is nothing wrong in being tempted by the devil. My advice is to never deviate from the Good... even a little could get you possessed [a little deviation could weaken "God's Shield" on you, allowing the devil to easily break in. This is why it's recommended to always ask for forgiveness in prayers, to keep fixing & strengthning the Shield.]
Please flee from him if you found out he is the devil. God is merciful. God forgives.
Else the devil wins & takes you to his kingdom of darkness in the last days.
Never take this write up as absolute truth. I honestly don't know the whole truth. Researching and asking questions will help you know the truth — never be closed minded.
Believe me 100%, the World is not what its rulers make you to think. There is UNIMAGINABLE deception going on.
We all know that God is the creator of everything in this world. God is loving and always there to help if we have a problems. God always forgive us from our sins. We should give thanks to him by always praying and going to church. While devil is an angel that is fall down to earth because of the bad things that he do. Evil is always around in every person to command bad things but God is also there to not do the temptation that the evil wants.