The only true faith in Allah's sight is Islam.
The only true faith in Allah’s sight is Islam. Those to whom the Scriptures were given (Jews and Christians) disagree among themselves, through insolence, only after knowledge had been vouchsafed them. He that denies Allah’s revelations should know that swift is Allah’s reckoning.
If they argue with you, say: “I have submitted to Allah and so have those that follow me.”
To those who have received the Scriptures (Jews and Christians) and to the Gentiles say: "Will you surrender yourselves to Allah?" If they become Muslims they shall be rightly guided; if they pay no heed, then your only duty is to warn them. Allah is watching all His servants.
Al-I-Imran The Imrans 3:19-20
Islam the only acceptable religion
He that chooses a religion other than Islam, it will not be accepted from him and in the world to come he will surely be among the losers.
Al-I-Imran The Imrans 3:85
You are forbidden to settle disputes by consulting the Arrows. That is a pernicious practice.
The unbelievers have this day abandoned all hope of vanquishing your religion. Have no fear of them: fear Me.
This day I have perfected your religion for you and completed My favor to you. I have chosen Islam to be your faith.
Al-Maidah The Table 5:3
Jesus said to him, "I am the way, the truth, and the life. No one comes to the Father except through Me.
26 If anyone among you thinks he is religious, and does not bridle his tongue but deceives his own heart, this one's religion is useless. 27 Pure and undefiled religion before God and the Father is this: to visit orphans and widows in their trouble, and to keep oneself unspotted from the world.
James 1:26-27 NKJV
Warning against False Religions
But there were also false prophets among the people, even as there will be false teachers among you, who will secretly bring in destructive heresies, even denying the Lord who bought them, and bring on themselves swift destruction. And many will follow their destructive ways, because of whom the way of truth will be blasphemed.
2 Peter 2:1-2 NKJV
Colossians 2:16-23 NKJV
16 So let no one judge you in food or in drink, or regarding a festival or a new moon or sabbaths, 17 which are a shadow of things to come, but the substance is of Christ. 18 Let no one cheat you of your reward, taking delight in false humility and worship of angels, intruding into those things which he has not seen, vainly puffed up by his fleshly mind, 19 and not holding fast to the Head, from whom all the body, nourished and knit together by joints and ligaments, grows with the increase that is from God.
20 Therefore, if you died with Christ from the basic principles of the world, why, as though living in the world, do you subject yourselves to regulations-- 21 Do not touch, do not taste, do not handle," 22 which all concern things which perish with the using--according to the commandments and doctrines of men? 23 These things indeed have an appearance of wisdom in self-imposed religion, false humility, and neglect of the body, but are of no value against the indulgence of the flesh.
1 John 5:5 NKJV
5 Who is he who overcomes the world, but he who believes that Jesus is the Son of God?
Revelation 12:10-11 NKJV
10 Then I heard a loud voice saying in heaven, "Now salvation, and strength, and the kingdom of our God, and the power of His Christ have come, for the accuser of our brethren, who accused them before our God day and night, has been cast down. 11 And they overcame him by the blood of the Lamb and by the word of their testimony, and they did not love their lives to the death.
Punishment for falling from the faith
Those that recant after accepting the true faith (Islam) and grow in unbelief, their repentance shall not be accepted. These are the truly erring ones.
As for those that recant and die unbelievers, no ransom shall be accepted from them: be it as much gold as would fill the entire earth. Woeful punishment awaits them, and none shall help them.
Al-I-Imran The Imrans 3:90
Falling from the faith
Hebrews 6:4-7 NKJV
For it is impossible for those who were once enlightened, and have tasted the heavenly gift, and have become partakers of the Holy Spirit, and have tasted the good word of God and the powers of the age to come, if they fall away, to renew them again to repentance, since they crucify again for themselves the Son of God, and put Him to an open shame.
2 Timothy 4:2-4 NKJV
3 For the time will come when they will not endure sound doctrine, but according to their own desires, because they have itching ears, they will heap up for themselves teachers; 4 and they will turn their ears away from the truth, and be turned aside to fables.
Those that have embraced the Faith and fled their homes and fought for the cause of Allah, and those that have sheltered them and helped them -- they are the true believers. Forgiveness and a gracious provision await them.
Those that have since embraced the Faith and fled their homes and fought with you - they too are your brothers; although according to the Book of Allah those who are bound by ties of blood are nearest to one another. Allah has knowledge of all things.
An-Anfal The Spoils 8:74-75
True Believers and their rewards
The true believers, both men and women, are friends to one another. They enjoin what is just and forbid what is evil; they attend to their prayers, and render the alms levy, and obey Allah and His apostle. On these Allah will have mercy. Allah is mighty and wise.
Allah has promised the men and women who believe in Him gardens watered by running streams, in which they shall abide for ever: godly mansions in the gardens of Eden: and, what is more, they shall have grace in Allah's sight. That is the supreme triumph.
At-Touba Repentance 9:71-72
Warning against False Teachers
Deuteronomy 5:31-33 NKJV
32 "Therefore you shall be careful to do as the LORD your God has commanded you; you shall not turn aside to the right hand or to the left. 33 You shall walk in all the ways which the LORD your God has commanded you, that you may live and that it may be well with you, and that you may prolong your days in the land which you shall possess.
Deuteronomy 11:16 NKJV
16 "Take heed to yourselves, lest your heart be deceived, and you turn aside and serve other gods and worship them,
Titus 1:10-16 NKJV
10 For there are many insubordinate, both idle talkers and deceivers, especially those of the circumcision, 11 whose mouths must be stopped, who subvert whole households, teaching things which they ought not, for the sake of dishonest gain. 12 One of them, a prophet of their own, said, "Cretans are always liars, evil beasts, lazy gluttons." 13 This testimony is true. Therefore rebuke them sharply, that they may be sound in the faith, 14 not giving heed to Jewish fables and commandments of men who turn from the truth.
15 To the pure all things are pure, but to those who are defiled and unbelieving nothing is pure; but even their mind and conscience are defiled. 16 They profess to know God, but in works they deny Him, being abominable, d