Quran Contradiction Disproves Islam

[paulpablo]

It clearly means Allah is capable of forgiving all sins.

Well actually the sentence implies that he does forgive all sins, there's a difference between saying "this is something I do" to "This is something I can do".

The verse says

Say: "O my Servants who have transgressed against their souls! Despair not of the Mercy of Allah: for Allah forgives all sins: for He is Oft-Forgiving, Most Merciful. -- Sura 39:53

Yet he doesn't

Verily, Allah forgives not that partners should be set up with him in worship, but He forgives except that (anything else) to whom He pleases, and whoever sets up partners with Allah in worship, he has indeed invented a tremendous sin.

Allah forgiveth not (the sin of) joining other gods with Him; but He forgiveth whom He pleaseth other sins than this: one who joins other gods with Allah, Hath strayed far, far away (from the right). -- Sura 4:116

Now this actually brings me back to another topic I asked a long long time ago.

I asked muslims why any christian would convert to Islam if they had already committed shirk and they are already destined for hell and I got told that they only get sent to hell if they commit shirk at the moment of death or something along those lines.
But the quran mentions nothing of the sort, it says god does not forgive shirk, it doesn't say

Allah forgiveth not shirk apart from he might forgive it later if you're very sorry and as long as you don't do it just before you die

It clearly says allah does not forgive shirk, so in fact if any other verses claim that god does forgive shirk as long as it isn't committed during death then this is also a contradiction.