Look Pandora we can say the same thing about your Bible:
trinity is never mentioned in your Bible, neither the original sin and the list goes on.
At leas in Quran we have medical, economical...etc miracles that nowadays science proves them. The problem here is that: Christians refuse this truth before trying to comprehend it.

I can say the same thing about your Bible: It lacks clear and obvious texts regarding Trinity. You see it this way that it contains (trinity) (atonement) which in fact they are not there.
Apart from the fact that your Bible is misinterpreted and distorted you have no right to ask Quran to be just like it, because it is a fact that every Divine religion has its own doctrines and way of worshiping Allah (God), simply it is not our way it is Allah's way and desire. Praying in Islam is different from yours and different from the Jews, the same thing your fasting is different from ours and theirs. But I wish this fact does not lead you to reject another divine religion like Islam which Allah the Almighty protected through all these centuries (more than 1400years), at the same time you have more than one copy of Bible and from time to time we hear that another manuscript is discovered. Even each of your theologians differ in giving exact and united explanation to Trinity (which is Christianity’s backbone), but in Islam we all agree upon our main and core believes but may be differ in the minor cases, and the difference is not of great deal and does not effect our main believes.
Your Bible is never trustworthy, it is written a couple of hundred years after Jesus, all of us know that those who wrote Bible never saw Jesus in their lives for one time. The case we have with our hadiths, some are weak, some are fabricated……. and so on. But we Muslims have a belief that even the hadiths are from divine because we have in Quran:

Nor does he speak from [his own] inclination. (3) It is not but a revelation revealed, (4) Al Najm
Yes that is true, if not how our Prophet (Allah’s peace and blessing be upon him) knew that black cumin is good for health? And so many other hadiths.

Sometimes you should know some background of a speech or a phrase you put. Like talking about hadiths, because when you repeat what you listen or write from your Christian point of view it appears an "odd" thing to you, and that does not help you.

So if you argue Islam from a neutral view and as we introduce it to you, you’ll find the truth that we are right, but it seems you always read the articles from you Christianity point of view, that whatever proofs we put in your hands you will find it still not enough and not satisfactory and say “there is still something wrong”.
It rather raises problems to others rather than Muslims. We have scientifically proven facts in Quran. And our Prophet is not without miracles and it is not an ordinary believe we have proofs to this. May be at the time of Jesus people believed in miracles and supernatural elements, the same thing to Moses, and at the time of our Quran the using of wonderful, impressive magnificent language was common, that is why many wonder about the language of Quran which is a miracle itself. Even geographical and medical fact are expressed in such a way.