So, according to the Quran, salvation is based on works and faith.  Basically, you can do whatever you want, but if as long as you do a good deed.  How can one earn salvation?  If God is so perfect, how can even one sinful person be allowed to enter Heaven?  I mean, imagine if the government legal systems worked like this.  Imagine if a serial murderer and rapist donated billions of dollars to charity to feed thousands of starving children in Africa.  Would we sit by and watch the judge release the guy because of his good deeds?

And as for those who believe and do good works, He will pay them their wages in full (Surah 3:57, emp. added).

Then, as for those who believed and did good works, unto them will He pay their wages in full, adding unto them of His bounty; and as for those who were scornful and proud, them will He punish with a painful doom (Surah 4:173, emp. added).

O ye who believe! If ye keep your duty to Allah, He will give you discrimination (between right and wrong) and will rid you of your evil thoughts and deeds, and will forgive you. Allah is of infinite bounty (Surah 8:29, emp. added).

And those who believed and did good works are made to enter the Gardens underneath which rivers flow, therein abiding by permission of their Lord, their greeting therein: Peace! (Surah 14:23, emp. added).

Say: O My slaves who have been prodigal to their own hurt! Despair not of the mercy of Allah, Who forgiveth all sins. Lo! He is the Forgiving, the Merciful. Turn unto Him repentant, and surrender unto Him, before there come unto you the doom, when ye cannot be helped (Surah 39:53-54, emp. added).

And those who believe and do good works and believe in that which is revealed unto Muhammad�and it is the truth from their Lord�He riddeth them of their ill-deeds and improveth their state (Surah 47:2, emp. added).

And whosoever striveth, striveth only for himself, for lo! Allah is altogether Independent of (His) creatures. And as for those who believe and do good works, We shall remit from them their evil deeds and shall repay them the best that they did.... And as for those who believe and do good works, We verily shall make them enter in among the righteous (Surah 29:6-7,9, emp. added).

Thou seest the wrong-doers fearful of that which they have earned, and it will surely befall them; while those who believe and do good works (will be) in flowering meadows of the Gardens, having what they wish from their Lord. This is the great preferment. This it is which Allah announceth unto His bondmen who believe and do good works. Say (O Muhammad, unto mankind): I ask of you no fee therefore, save lovingkindness among kinsfolk. And whoso scoreth a good deed We add unto its good for him. Lo! Allah is Forgiving, Responsive. Or say they: He hath invented a lie concerning Allah? If Allah willed, He could have sealed thy heart (against them). And Allah will wipe out the lie and will vindicate the truth by His words. Lo! He is aware of what is hidden in the breasts (of men). And He it is Who accepteth repentance from his bondmen, and pardoneth the evil deeds, and knoweth what ye do. And accepteth those who do good works, and giveth increase unto them of His bounty. And as for disbelievers, theirs will be an awful doom (Surah 42:22-26, emp. added).

And lo! unto each thy Lord will verily repay his works in full. Lo! He is informed of what they do. So tread thou the straight path as thou art commanded, and those who turn (unto Allah) with thee, and transgress not. Lo! He is Seer of what ye do.... Establish worship at the two ends of the day and in some watches of the night. Lo! good deeds annul ill deeds. This is a reminder for the mindful. And have patience, (O Muhammad), for lo! Allah loseth not the wages of the good (Surah 11:111-112,114-115, emp. added).

Now, consider what the New Testament has to say about this topic.

Ephesians 2:8-9  For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast.

Romans 3:23-25   for all have sinned and fall short of the glory of God, and are justified by his grace as a gift, through the redemption that is in Christ Jesus, whom God put forward as a propitiation by his blood, to be received by faith. This was to show God's righteousness, because in his divine forbearance he had passed over former sins.

Romans 3:28 For we hold that one is justified by faith apart from works of the law.

Romans 10:1-10  Brothers, my heart's desire and prayer to God for them is that they may be saved. I bear them witness that they have a zeal for God, but not according to knowledge. For, being ignorant of the righteousness that comes from God, and seeking to establish their own, they did not submit to God's righteousness. For Christ is the end of the law for righteousness to everyone who believes. For Moses writes about the righteousness that is based on the law, that the person who does the commandments shall live by them. But the righteousness based on faith says, "Do not say in your heart, 'Who will ascend into heaven?'"(that is, to bring Christ down) or "'Who will descend into the abyss?'"(that is, to bring Christ up from the dead). But what does it say? "The word is near you, in your mouth and in your heart" (that is, the word of faith that we proclaim); because, if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved. For with the heart one believes and is justified, and with the mouth one confesses and is saved. 

God knows that His standard is too high, so He offered a way to save us.  If God simply showed mercy just because we tried to do a few good deeds, what kind of just God is that?  I believe in a God of justice who demands payment for sins.  But the good news is that He has provided this and shown that His grace is sufficient for our salvation.  How many of you become frustrated because you try your hardest to please Allah and you wonder if it will ever be enough?

Here are the verses that have prompted suicide bombers, the suposedly receive immediate paradise. 

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YUSUFALI: He will forgive you your sins, and admit you to Gardens beneath which Rivers flow, and to beautiful mansions in Gardens of Eternity: that is indeed the Supreme Achievement.
PICKTHAL: He will forgive you your sins and bring you into Gardens underneath which rivers flow, and pleasant dwellings in Gardens of Eden. That is the supreme triumph.
SHAKIR: He will forgive you your faults and cause you to enter into gardens, beneath which rivers flow, and goodly dwellings in gardens of perpetuity; that is the mighty achievement;