Allah - Who is Allah
Allah is The One and Only God Of all creations
The word 'Allah' comes from the Arabic word 'ilah', which means a 'deity', 'god', 'divine'. Then you have the Arabic word 'al', which literally means 'the'. When you put them together, the two words 'Al' and 'ilah' become 'Allah', which means 'The God', or the One Worthy of Worshiped.
Even though the Jews, Christians and Muslims have different concepts of the Almighty God, Muslims worship the same God of Adam, Moses, Abraham, Noah, David, and Jesus - Peace Be Upon Them All! Muslims reject the belief, or concept of the Trinity because Allah (SWT) said in the Holy Quran that there is only One True God, Allah (SWT).
Allah (SWT) teaches us, through the Holy Quran, and through Moses, Abraham, Jesus - Peace Be Upon Them All, and through the Last Prophet, Muhammad (SAAWS) that men have distorted the belief of One Almighty God, Allah (SWT).
Pick up an Arabic Bible and you will see the word 'Allah' used for the word 'God' found in an English Bible! The word 'Allah' cannot be made to plural and this is because the word 'Allah' is Singular, which goes hand in hand with the Islamic concept of One God.
Allah in the Aramaic Language spoken by Jesus (PBUH)
If you look at the Aramaic word 'El', you will see that 'El' means 'God' in Aramaic, the language Jesus Christ (PBUH) spoke! Isn't the word 'El' more similar to the word 'Allah' than the word 'God'? In the Hebrew words for God, you will see the words 'El' and 'Elah', which is very close to the word 'Allah' - And this is because Aramaic, Hebrew and Arabic are all Semitic languages sharing common origin.which is the word that the Prophet Jesus (PBUH).
The word 'Allah' and its deep religious meaning, or message
The word 'Allah' stems from the Arabic verb Ta'allaha, or 'alaha'! In Arabic, the word 'alaha' means 'To Be Worshiped', or the Only One who deserves to be worshiped'.
Just because the word 'Allah' is an Arabic word, it does not mean that it is for Arabs only, or is an Arabian god! Allah is The One god that deserves your worship and if your language has a word that describes 'One Almighty God', the Only One that deserves your worship, i.e.: 'Yahweh', 'Dios'. or 'Dieu', than be it. Allah understands all the languages because he is our Creator, and the Creator of the language you use!
Call upon Allah by his Most Beautiful Names
Throughout the Holy Quran, various names of Allah are used such as Al-Rahman, Al-Rahim, and so on! This brought some questions by some Arabs 'Is this a new God?'. Allah (SWT) answered their question with the following verse:
'Say: "Call upon Allah, or call upon Rahman: by whatever name ye call upon Him, (it is well): for to Him belong the Most Beautiful Names' Surah Al-Isra (17) Verse 110.
Should I use the word 'Allah' or 'God'?
I was thought to always ask the person you meet, or you are speaking with, how they pronounce their name and you should continue calling them by exactly the way they want you to call them!
Allah (SWT) refers to himself, in the Holy Quran, as Allah, thus, it is good to refer to your creator, the One God, as 'Allah'! Beside, when you do that, you are actually asserting of the uniqueness of God (Allah) because the word 'Allah' cannot be made into plural, or anything that would indicate a gender. In the other hand, the word 'God' can be made plural 'Gods', and have a gender 'Goddess'!
Remember/Be Conscious, or Fear Allah - Your Creator
Always Remember Allah, your Creator, your Sustainer wherever you are, whatever you are doing and at all times for he (Allah) is the ever watchful over you! Whenever you are hit with a calamity, always remember Allah for he will remember you. Whenever Satan whispers to you to do bad deeds, Fear Allah and know that he is ever watchful and knows exactly what you are about to do before you even think about doing what you are about to do and take 'Allah' as your Friend, and Satan as your Sworn Enemy!
Remember 'Allah' whenever good has been bestowed upon you, and always remember Allah, and be thankful of what he blessed you with, for he could've easily blessed someone other than you! 'Allah' is your creator, your Sustainer when you are hungry! Remember that 'Allah' created you from a single soul, and from that soul, he created his partner, and then countless men and women.
'O mankind! Be careful of your duty to your Lord Who created you from a single soul and from it created its mate and from them twain hath spread abroad a multitude of men and women. Be careful of your duty toward Allah in Whom ye claim ( your rights ) of one another, and toward the wombs (that bore you ). Lo! Allah hath been a Watcher over you.' - Surah Al-Nisa (4) verse 1.
'Allah' is the only One God you will ask forgiveness from on Judgement Day, The only one that you will seek Mercy from, and without it, you will be the dweller of the Hell-fire! So fear Allah now and you shall be safe tomorrow!