Whoever associating partners (idolatry, polytheism etc,) with Allah, then Allah will forbid paradise to him, and his abode will be hell-fire. If you have ever associated partners with Allah in the past, repent sincerely to Allah and never return to it and save yourself from Hell-fire.
Allah, the Exalted, says: " Surely, they have disbelieved who say: 'Allah is the Messiah (Jesus), son of Maryam (Mary).' But the Messiah (Jesus) said: 'O Children of Israel! Worship Allah, my Lord and your Lord.' Verily, whosoever sets up partners (in worship) with Allah, then Allah has forbidden Paradise to him, and the Fire will be his abode. And for the Zaalimuun (polythesists and wrong-doers) there are no helper.
Surely disbelievers are those who said: 'Allah is the third of the three (in a Trinity).' But there is no god (none who has right to be worshipped) but One God (Allah). And if they cease not from what they say, verily, a painful torment will befall on the disbelievers among them.
Will they not turn with repentance to Allah and ask His Forgiveness? For Allah is Oft-Forgiving, Most Merciful.
The Messiah (Jesus), son of Maryam (Mary), was no more then a Messenger; many were the Messengers that passed away before him. His mother maryam (Mary) was a Siddiqah (i.e. she believed in the Words of Allah and His Books.) They both used to eat food (as any other human being, while Allah does not eat). Look how We make the Ayaat (proofs, evidences, verses, lessons, signs revelations, etc.) clear to them; yet look how they are deluded away (from the Truth).
(Qur'an 5: 72-75)
Allah's Messenger 'Peace Be Upon Him' said, "Allah is more pleased with the repentance of His slave than anyone of you is pleased with finding his camel which he had lost in a desert.'
(Sahih Al-Bukhaari)
There is no god but Allah
Surah Al-Ikhlas was revealed to Prophet Muhammad (Peace Be Upon Him) during the early days of Islam. The polytheists and pagans of Mecca one day approached and challenged him saying, 'Give us the genealogy of your Lord.' It was then that Allah revealled this surah.
In the Name of Allah the Most Gracious, the Most Merciful.
1. Say [O Muhammad]: "He is Allah, (the) One,
2. "Allah-us-Samad {Allah the Self-Sufficient Master, Whom all creatures need, (He neither eats nor drinks)}.
3. He begets not, nor was He begotten,
4. And there is none co-equal or comparable unto Him."
(Qur'an 112:1-4)
Allah's Messenger (Peace Be Upon Him) said: "You shall not enter Paradise until you believe, and you have not believed until you love one another. Shall I tell you of something you can do to make you love one another? Spread the greetings of Salam (peace) amongst yourselves (i.e. between each other).
(Muslim)
Three characteristics, whoever combines them, has completed his faith: (1) to be just, (2) to spread greetings to all people, (3) to spend (charitably) out of the little you have.
Abdullah bin Umar (RA) said: A man asked the Prophet (Peace Be Upon Him), "What is the best act of Islam?" He said:" To feed others and to give greetings of Salam (peace) to those whom you know and to those whom you do not know."
(Al-Bukhari)