1. No scientific assertion made in the Quran can be disproved.
2. Islam’s politico socio-economic system is the best The democratic system in the world, even far outweighing present day democracy in many many aspects.
3. The strong bases of Morality, collective ethical effort by the people of faith.
4. Islam not only says that all your good deeds is just a good thing and just generally encourages it. Ahan! You will be held accountable for your deeds in the Judgement day. This automatically straightens up the person.
5.  The element of Philosophy in Quran is very strong, dynamic and appealing. The philosophical approach it takes to prove its own assertions and rules.
6.  The War ethics defined in the Quran are unmatched, picking up some verses out of the context has been an old strategy to discourage Quran but actually, Quran’s presented War ethics such as don’t kill the old people in the War, don’t hurt the women neither the children.
7. There hasn’t been any change in Quran what-so-ever in the last 1400 years. This is nothing short of a Miracle, if you want to give a reference of such and such a poet who was 1500 years ago and his writings aren’t changed as well, then you should know that from literature’s perspective there is a huge amount of difference between such a detailed book and just poetry.
8. Quran also has stood the test of time, every time. The time of poetry, the time of philosophy now the time of science. (Just to name a few fields)
9. The character building that Quran and the Sunnah (Sayings and the acts of Prophet (PBUH) does is unmatched. If you being honest can find any book of manners better than this, than you won’t be able to do so.
10. Last but not the least, Quran & sayings of the Prophet (PBUH) provides such a strong reason for existence, a hot topic in the world of Philosophy since a long time, it has been solved 1400 years ago, just easily.
11. The Islamic Revolution in that Era is the greatest revolution in the history of Mankind, you read it right. There is no revolution greater than that.

These are major signs which you can look at and think, just think that if these 11 points are neither last and nor least, how deep and educating is Islam and if it is not God, then who is it? with such vast depth of certain knowledge.
It is a shame, but it has to be said that Don’t learn Islam from the actions of Muslims, learn from the books and you will be able to appreciate the beauty of Islam.