Please let me know cause am bit confussed??

Well, just because you seem sincere...

Satan is an old old hebrew word completely mistranslated to mean some pagan god that got mixed into early christianity around the 3rd century.

What satan actually means, in hebrew, is "defence advocate" or public legal representation. Strictly translated it means "arguer" but that was the word used for public advocates back then.

It doesn't mean anything bad. It is a completely neutral title, and not a name, not a noun, it is a verb and a title.
A child arguing that they did not steal some cookies is playing the role of satan. That doesn't mean you need to kill the child. It means they're making a legal defence, and you should make an intelligent prosecution of your case to satisfy them, and maintain civilised proceedings within your house.

As opposed to animist egotism and rule by dictatorship, which gets parents, not children killed rather, you'll invariably find.

And yes, women argue about everything, constantly.

Could be something to do with blokes trumping them on fists.

But yes, strictly speaking, the word fits. A neutral word, not a bad word, and it is a necessary element of humanism.

Just to add a little more qualified theology, which religious fundamentalists like to ignore for obvious reasons like personal agendas or mental illness,

Lucifer which appears in christian bibles is a hebrew monarch title, like "Richard the Lionheart", Lucifer means "shining light" or "morning star" and was given to Nebudchannezzar, whom also appears in the bible. It was his political title. It's not a fallen angel or anything like that.

In fact there is no mythology in old hebrew. It's all just records and politics and legislative minutes. Quite boring actually. Kabbalists introduced all the mythology and pentacostal christians took it to new heights that we have to (unfortunately) live with today.

Anyhoo, Lucifer is just Nebudchannezzar, just some regular king who was a bit of an arse-monkey.

Also:
Demon, originally meant angel or nobleman. Pretty interchangeable words in old hebrew actually, nphlm and serphm (by encounter or dream respectively). Also mistranslated as giant.
Some rabbi in the 1st century did a pinnacle mistranslation of hebrew to greek which turned "divine messenger" into "ancestral spirit" (greek: damon), which in latin bibles reads "spirit" (latin: demon), which then when the British got involved, turned into "malevolent spirit" (middle english: deuil, modern english: devil).

And devil as a word didn't even exist until after the 13th century. No such thing in early scriptures original documentation.

These concepts are pagan, not hebrew, christianity adopted them, but not from its claimed roots. From people it was converting along the way, who believed in angry spirits we should all fear and stupid ways like that of running a society.

Do you go to work and kiss your wife because you're scared of angry spirits? No. So it doesn't build a damn thing.