dontconvert2islam sees the higher purpose; Islam, like the universe, founded on truth?

In answer to the video "Worst Creatures in Islam"

When all has been created with an inner truth, for a higher purpose and for an appointed term in a universe whose phenomena all testify to a higher reality 30:8,14:19,10:3-6 by Allah who is Truth in essence 22:6,62 it necessitates that everything false or based on falsehood, ie devoid of its higher purpose ultimately perishes. That is why, as said previously, only the Truth in one's actions will be measured

7:8"The weighing on that day is the true. As for those whose scales are heavy, they are the successful".

Their deeds are therefore nullified in the Hereafter, and their good deeds, that is, those deeds in accordance with their "self-reproaching soul" and innate understanding of good and evil will be restrained to this passing world

18:104"lost in this world's life"

as if they were lushful vegetations that then become

18:45"dry broken into pieces which the winds scatter".

The restriction of these deeds to this passing world means they will have no value in the Hereafter because they were not done with the right perspective of building a relationship with God. Such people are described as labour-weary and exhausted on the day of resurrection 88:3. Because they had laboured a lifetime without the perspective of the hereafter in mind, they thus wake up to a gloomy situation, seeing their efforts spent for nothing. Their corresponding reward will be paid in this world, because the Quran repeatedly says that Allah never lets the good deeds remain unrewarded

42:20,46:20,17:18,11:15-16"Whoever desires this world's life and its finery, We will pay them in full their deeds therein, and they shall not be made to suffer loss in respect of them. These are they for whom there is nothing but fire in the hereafter, and what they wrought in it shall go for nothing, and vain is what they do".

This general statement covers all people, regardless of their belief or profession of faith, including Muslims who also may sometimes transgress and conduct themselves hypocritically or with a strict materialistic mindframe. Certain crimes and great sins however warrant a punishement so severe that the nullification of the reward does not only concern the next life, but also the present one 2:217,3:21-2. 

As regards the previously mentionned notion of restraining the reward of certain good deeds to this present life only, the New Testament speaks of the same principle, when it quotes Jesus in Matt6 about those who do "good" without any perspective of the Hereafter such as praying, fasting or giving to charity only to be seen by men that they will have no reward in the Hereafter and that they will be paid in full in this world only, meaning the deed will not be considered as "good" in the Hereafter

"Truly I tell you, they have received their reward in full"

or as stated in the Quran

4:142,107:4-6"So woe to the praying ones, Who are unmindful of their prayers, Who do (good) to be seen".

Those who die while still guilty of shirk with God/attributing equal or superior authority to anything besides God will suffer the same fate

39:65"And certainly, it has been revealed to you and to those before you: Surely if you associate (with Allah), your work would certainly come to naught and you would certainly be of the losers".

Shirk is the major roadblock to mankind's spiritual purpose. Although God could forcefully make one achieve that goal of creation, by for instance erasing all reasons for the spiritual dissensions among the humans 42:8, He has decreed in accordance with divine justice, moral accountability, and the overarching principle of no compulsion in religion 2:256,18:29 that we must maintain and nurture our own inner selves through tazkiya 87:14,91:7-10. The word stems from z-k-w, used concretely for a plant that matures well and bears fruit. It is metaphorically used for all religious directives, particularly charity/zakat, as they help one to grow spiritually and bear fruit in the hereafter. Tazkiya is a process ultimately beneficial for one'self 35:18, manifesting itself in the above spoken notion of servitude to God. 

There is a reason the Quran constantly lays stress on God's transcendental oneness and uniqueness; the acceptance of that concept frees man from all sense of dependence on other influences and powers, and thus elevates him spiritually and brings about that tazkiya/purification, for Allah alone is the way to achieve that goal 4:49. Because shirk with God/ascribing an equal or superior authority to anything besides Him, compromises that objective, the Quran describes it as the only unforgivable sin if left unrepented for until the signs of death, anything other than that may or may not be forgiven by God if left unrepented for, according to God's knowledge, justice, mercy  4:48,116,25:68-71,39:53-55. 

It is to be kept in mind that just as there are intrinsic rights in creation depending on rank, for example the rights of an insect arent as those of a sentient animal, nor of a human, nor king, similarly God epitomizes maximal rights, honour and authority vis a vis the humans. Denying His supremacy is thus the maximal transgression of a human in relation to Him. Hence the categorization of this sin as the highest in severity.

Other sins, if left unrepented for, lead to the same consequences, such as hypocrisy, blind denial of the truth and pursuit of falsehood, aversion to the divine guidance, death after having apostised, unjustified murder of the righteous 2:217,3:21-2,5:52-3,18:105,47:1-9. However the most extreme case of loss is the one, regardless of his level of righteousness, that falls into a type of sin that renders all previous upright deeds devoid of any value in the Hereafter. Among high profiles of righteousness having instantly lost themselves to a great sin the traditions speak of iblis, and the Quran, after providing a list of honorable prophets states that

6:88"and if they had set up others (with Him), certainly what they did would have become ineffectual for them".

The HB similarily states the good deeds of the righteous are all erased if he should fall into idolatry and persistently comit the great sins without repenting, thinking that his past righteousness will save him Ezek18:24,33:13. As observed by the prophet Solomon righteousness can quickly be outweighed by even a single sin

Ecc10:1"Fying flies make putrid and foamy the oil of a perfumer; so does a little folly outweigh wisdom and honor".

In parallel to the circumstances leading to the nullification of the good deeds, the Quran also says that when a person's actions satisfy all criteria of acceptability, then it is the evil deeds that are nullified 11:114,29:7. This rewarding, cleansing process occurs in the Hereafter prior to the successful's entry into Heaven, a place of perfect purity, as a gracious gift from God. Since paradise is a place of purity and cleanliness; a person tarnished by the impurities of sins, even the minutest ones, cannot enter it only after forgiveness. It is granted at different stages after death, depending on the necessary cleansing process that will be needed for each individual. While some will receive it immidiately and therefore will not be made to experience any difficulty after death and until their entry in Paradise, others will go through the "fitna", as will be detailed a little later. Almost all verses speaking of the reward in the Hereafter of those striving for goodness and piety, who do their utmost to avoid sinning and only do so by mistake or ignorance, first mention God's forgiveness 3:133,5:9,34:4,35:7,36:11,64:9,67:12.