The ruling of Islam concerning other religions is that they are all either fabricated and false, or abrogated.
The fabricated and false religions are those like the ancient Arabian practise of worshipping idols and stones.
The abrogated religions are those which were taught by the Prophets who came before our Prophet Muhammad (peace and blessings of Allaah be upon him). They are valid in that their origins are from Allaah, but Islam came and took their place, not with regard to basic beliefs such as the existence of God, the angels, Paradise and Hell, for these are matters which all the Messengers have in common, but there are differences between them with regard to ways of worshipping and drawing close to Allaah by means of prayer, fasting, pilgrimage, alms, etc. The later followers of the Prophets have fallen into deviations of belief and shirk, but Islam came to point that out and bring people back to the correct belief taught by the earlier Prophets.
It was narrated that Abu’l-Darda’ (may Allaah be pleased with him) said: ‘Umar brought some pages of the Tawraat to the Messenger of Allaah (peace and blessings of Allaah be upon him) and said, “O Messenger of Allaah, these are some pages of the Tawraat which I took from a brother of mine from Banu Zurayq.” The expression of the Messenger of Allaah (peace and blessings of Allaah be upon him) changed, and ‘Abd-Allaah ibn Zayd – who had been shown the adhaan [in a dream] – said, “Has Allaah taken away your mind? Do you not see the expression on the face of the Messenger of Allaah (peace and blessings of Allaah be upon him)?” ‘Umar said, “We are pleased with Allaah as our Lord and with Islam as our religion and with Muhammad as our Prophet and with the Qur’aan as our guide.” Then the Messenger of Allaah (peace and blessings of Allaah be upon him) relaxed [?}, and said, “By the One in Whose hand is my soul, if Moosa were to come among you and you were to follow him and leave me, you would have gone far astray. You are my share among the nations and I am your share among the Prophets.” (Narrated by Ahmad, 15437).
Ibn Hajar said:
All the isnaads of this hadeeth are such that they could not be taken as evidence individually, but when taken together they prove that this hadeeth is correct. (Fath al-Baari, 13/525).
The evidence for that is the verse in which Allah says (interpretation if the meaning):
“And whoever seeks a religion other than Islam, it will never be accepted of him, and in the Hereafter he will be one of the losers”
[Aal ‘Imraan 3:85]
Imam al-Tabari said in his commentary on this verse:
What Allaah means by that is that whoever looks for a religion other than Islam to follow, Allaah will never accept that from him, “and in the Hereafter he will be one of the losers” meaning, one of those who deprived themselves of their share of the mercy of Allaah.”
(Tafseer al-Tabari, 3/339)
Islam does not regard them (followers of other religions) only as sinners, but as kaafirs (disbelievers) who will abide forever in the Fire of Hell, as stated in the verse quoted above.
He (the kaafir) will be a loser in Hell, and will not come of out it. It is not possible for a kaafir to enter Paradise unless he becomes Muslim. Allaah says (interpretation of the meaning):
“Verily, those who belie Our Ayaat (proofs, evidences, verses, lessons, signs, revelations, etc.) and treat them with arrogance, for them the gates of heaven will not be opened, and they will not enter Paradise until the camel goes through the eye of the needle (which is impossible). Thus do We recompense the Mujrimoon (criminals, polytheists, sinners)”
It was proven that the Prophet (peace and blessings of Allaah be upon him) said: “By the One is Whose hand is my soul, no one of this nation, Jew or Christian, will hear of me and not believe in that with which I have been sent, but he will be one of the people of Hell.” (Narrated by Muslim).
We ask Allaah to guide the seekers of truth from other religions to look into the religion of Islam and its Book, the Qur’aan. May Allaah guide them and open their hearts to enter Islam.