Oh there are so many things that I find Islam to be the true religion.
Every religion that has at least one genuine follower is a true religion
Says who? The true religion is from Allah alone. So either back up your claims that it is from God or drop it.
- It is the only religion that provides guidance in EVERY aspects of human life, hence it is the most complete religion
All religions provide guidance of some description, some good, some not so good; but the authors of them thought they had all aspects covered
You completely sidestepped the point. It doesn't matter if they thought they had everything covered. Islam has everything covered. While others flounded about making up rules for problems their texts can't address, Muslims have a clear guide.
- Its scripture, the Qur'an, is the ONLY scripture that is unchanged, unaltered
Other holy books have very fervent followers who have a strong view of their scriptures which could make them feel their versions are better.
Another sidestep. It doesn't matter if they FEEL that it is better. The Quran has not been altered and this is historically demonstrable and a sign from Allah.
- The life of its messenger, Muhammad SAW, is well-documented to the minutae details and provide best examples how to live life
Most sects have a figurehead who radiates perfection to its followers.
Not all characters are created equal. Not all made so many prophecies that were true. And most of all, none were as successful as the Prophet pbuh who is regarded by histories to be the most successful religious personality and most influential individual in history.
Moreover, this si where authenticity comes in. Followers often add and embellish the lives of their leaders but in Islam, the science of hadith eliminates this problem and leaves a true account of the Prophet's pbuh character.
- As I am a scientifically-inclined person, I find things in the Quran that is proven/known only centuries later after it was revealed
A personal view that gives one safety in a stormy world, but not science based.
Your comment appleis more to you than anyone else. Muslims reached the height of their scientific progress right after revelation showing that Islam encourages scientific pursuit (the scientific method was pioneered by early Muslims). Moreover, the scientific miracles in the Quran such as the creation of rain and origin of iron are clear indications of divinity.
- The teachings of islam appeal intellectually to me
A personal view that others have in relation to their own beliefs.
There is no doubt that the teaches of Islam appear to the intellect as has been shown by the scientific progress of early Muslims. Unlike Christians who had to kick their faith to the curb before they could advance scientifically.
- I see/witness that people who truly observe the teachings of Islam are truly happy persons despite circumstances and most righteous
A common feeling amongst religious peoples of many faiths
Righteousness is only called so if God deems it so. Those people who consider themselves good would have to show that their definition of good is supported by God.
- I have had numerous personal experiences that strengthen my faith in Islam
A common occurrence amongst religious peoples of other faiths
True enough. But one must understand the differences between such experiences. Most, if not all, Muslim reverts give intellectual arguments and often cite scripture and logic as the basis for their faith. Unlike Christians who cite ambiguous dreams, feelings, or apparritions which more often than not are delusions of their own making and comparable to the effects of hallucinogens.