That again to me seems like a human excuse to avoid explaining why an all powerful god does not clearly and irrevocably makes his will clear. There is no indication whatsoever that the americas ever had even an attempt at monotheism, let alone something approaching the abrahamic religions prior to exposure to europeans (who then brought christianity, not islam). Nor any indication in the quran that the americas exist and need exposure to the faith.
The same with australia.
China was only reached by conventional means and Japan again has no records of any attempt at monotheism until they came into contact with europeans.
'Yeah, god TOTALLY did give them the message, but they killed them and never listened' is the excuse of a five year old in a makebelief game. There is no proof whatsoever except in the very book(s) that claim it.
The same with the quran being the final revelation of god, the mormons would disagree with you there.
So were the books of mormon. In fact there are testified witnessess to those and they are newer. Why are you not a mormon?
I'm not saying that Islam forces people to act violently or anything, but the followers of islam quite quickly occupied North africa, most of the middle east, the Persian empire, parts of the Byzantine empire and most of spain. Claiming that this was done non-violently is absurd.
Sure they didnt convert people at swordpoint, which is a step up from christianity, but they DID put a massive social incentive on being muslim.
Dietary laws, mandatory prayer and ramadan spring to mind.
There is no biological reason to avoid any of the proscribed foods and no specific gain by slaughter in the specific way. It's pure human prejudice.
If god considers how you lived, why bother with the prayer 5 times a day, that time could be used productively aiding others.
Ramadan is cleary designed by someone that has NO clue that different parts of earth have differnt lengths of day. Its tied to the moon, so skips trough the year. Unimportant in the middle east, where seasonal lenght of day is not an issue, but muslims living at/near the (ant)arctic circle have a major problem during the summer when the sun doesn't set. An all powerful god would have known this and added provisions BEFORE the problem is encountered.
Again, that seems like a human covering his bases. A true god would be able to convince the whole world without immediately violating free will. And at the same time would have prevented a massive amount of secular bloodshed.