In the end, the Koran states, Allah will weigh one’s good works with their bad works.

And the measuring out on that day will be just; then as for him whose measure (of good deeds) is heavy, those are they who shall be successful; And as for him whose measure (of good deeds) is light those are they who have made their souls suffer loss because they disbelieved in Our communications. Surah 7:8-9 Then as for him whose good deeds are preponderant, these are the successful. But those whose balance is light, will be those who have lost their souls, in Hell will they abide. Surah 23:102-103

Not only do good works place a difficult burden on people, the Koran places an undefined burden on people. The Koran never speaks of the acceptable limit of good works versus bad. Is 50% good works enough? Do some good works count as more "good" than others? Are we graded on a sliding scale, determined by how good others are in comparison to my good works? If salvation was determined by good works, a Muslim would never know the outcome until we die and stand before Allah.

In fact, it could come down to the weight of a mustard seed.

And We will set up a just balance on the day of resurrection, so no soul shall be dealt with unjustly in the least; and though there be the weight of a grain of mustard seed, (yet) will We bring it, and sufficient are We to take account. Surah 21:47

Then again, what if Allah is in a bad mood or tired after a long day? Will his emotional state be a factor?

So one could do lots of good deeds, but if the scale is off by an ounce, it’s hell for that person. Does this seem fair?

This is saying that no one really knows how one’s life will turn out. Even Muhammad could not make any strong declaration as to his salvation. Saddam Hussein, in his final letter before his hanging, also hoped that Allah would judge him favorably.

If this standard of works is true, then there is uncertainty and doubt in everyone’s heart until Judgment Day when Allah looks at our lives and places them on the scale. If someone is one righteous act short, they are doomed to hell.

Also unknown is the weight and gravity of certain acts. Does adultery weigh more than lying? What’s the weight of stealing and does it depend on the size and value of the item stolen?

If one cannot answer that now, we all live in dread until the Day of Judgment.