Tawheed in the Essence of Allah

Tawheed with regard to the Essence of Allah denotes confessing that the Essence of the Lord of the worlds is one, and that He is Eternal. He is the Orignator of every action and phenomenon, whether perceptible through senses or not. There is no other cause except Him. Belief in multiple causes is Shirk. The Zoroastrians believe in the existence of two powerful forces in the Universe, both being equal and eternal. One is good, the other, evil. The god of good is Yazdan and the god of evil is Ahriman. The following ayat of the Holy Quran is a clear refutation of this false hypothesis.

"Say (O Muhammad): All is from Allah."
(Surah Nisa 4:78)

The claim of the Dualists can be refuted with a simple statement that there is no one except Allah, who has been in existence since eternity. Whatever was in past, present or future is nothing but good. Or, at least we can say that good exceeds evil and that evil does not hold sway over good.

However if we go on to explain all this in detail it would lead us away from the topic of our discussion.

Christians Are Polytheists Too

The Christians believe in the trinity of the Godhead. The Father (God), The Son (Jesus) and the Holy Ghost (Jibraeel). They believe that each of them have a special quality and that together they constitute the Godhead. The Quran flays their assertion thus:
"Certainly they disbelieve who say, 'Surely Allah is the third (person) of three'; and there is no god but One God."
(Surah Maidah 5:73)

The Holy Quran clearly states that Allah is not one-third of a god. He is the One and only One God.

The belief in Trinity is not exclusive to the Christians. Hindus and Buddhists also ascribe to it.

Idol Worship is Polytheism

Some people allege that there are separate gods for every phenomenon. That is, god of wind, god of sea, etc. This is another form of Polytheism. These people consider different creations to be the handiwork of different gods. These idolaters and polytheists worship multiple deities. Their polytheistic belief has also been denounced in the Holy Quran:
"Are sundry lords better or Allah, the One, the Supreme?"
(Surah Yusuf 12:39)

- Greater Sins, Vol. 1