Thanks for the question syllia
.
1.what do you think of islam?
Well, I have mixed feelings I must admit. On the bright side, theologically I think Islam pretty much has its act together. It is a lot more convincing than Christianity on the validity of its scriptures for example. It also seems much more rational than Christianity, desiring to strengthen its foundations with facts.
But perhaps that has a flip side. I must say Islam feels like fairly cold and legalistic religion, which seems spiritually weak. It's almost as if the rules outweigh the principles and the message. When I listen to Christians I hear nothing but 'love, love, love, love'. When I listen to Muslims it seems they talk most about doing A when confronted with B, like if its allowed to pop a pimple during Ramadan
. I get a feeling that there is a lot of "letter of the law" prevailing over the spirit of it. I'm sure you will disagree, but that is very much the impression I get to be honest.
2.Why don't you choose islam and be a muslim?
Because I don't feel God at the moment, nor do the rational arguments in favor of it appear very convincing. Especially the Christian/Jewish/Muslim concept of God seems unsatisfactory. Islam is an attractive religion in some ways though, for example the strong sense of brotherhood. But like I said, the concept of God behind it does not make sense. The problem of evil gets no real answer and the God as it is portrayed often seems vain, threatening and hostile. These are not qualities I respect in humans so I have trouble identifying with such a God.
3.Is there any particular rulings in Islam that you don't agree. If yes, what is it?
It depends. Islam is not monolithic of course, and no doubt the overwhelming majority of its rulings make sense. But sometimes when I browse islam-qa.com I see the weirdest things. Let me make a small selection:
Example #1:
http://www.islam-qa.com/index.php?ref=13730&ln=eng&txt=funeral church
Question: Is it permissible for a Muslim to attend the funeral of a non-Muslim friend if it is in the church, as a sign of respect for the deceased?
Answer: It is not permissible for the Muslim to attend the funeral of a kaafir or to enter their churches, even if that is a sign of respect etc, because attending the funeral is a way of showing love and respect, and it is not permissibl to show that towards a kaafir, according to the correct view. Moreover the questioner says, “to attend the funeral of a non-Muslim friend” – but it is not permissible for a Muslim to take a kaafir as a friend, because Allaah has commanded us to regard them as enemies, to shun them and to keep away from them.
With all due respect. But this just makes me feel sick. It's just vile hate speech. Luckily they are differences of opinion on stuff like this, but that it is even required to debate it within Islam makes me want to cry. Muslims sometime talk about non-Muslims as if they are beasts and subhumans. I can't even begin to imagine the amount of damage this view has done to dawah activities by sincere and more moderate Muslims.
Example #2
http://www.islam-qa.com/index.php?ref=10382&ln=eng&txt=concubines
Ruling on having intercourse with a slave woman when one has a wife
Answer: Islam allows a man to have intercourse with his slave woman, whether he has a wife or wives or he is not married. [...] A slave woman with whom a man has intercourse is known as a sariyyah (concubine) from the word sirr, which means marriage. [...] The scholars are unanimously agreed on that and it is not permissible for anyone to regard it as haraam or to forbid it. Whoever regards that as haraam is a sinner who is going against the consensus of the scholars.
The fact that there are actually people out there that seem to think Islam teaches that:
1. Taking non-Muslim female civilians as slaves during war is normal
2. It's okay to use them for sex
Again, I know there are other Muslims who think there is no such consensus and that slavery is frowned upon by God. But again, that this even has to be debated is mind boggling. I know Muslims don't go around taking slaves, but that this is supposedly God's ruling according to these learned scholars of Islam is something that makes me doubt it can be the word of God.
Example 3: (last, but not least!)
http://www.islam-qa.com/index.php?ref=377&ln=eng&txt=dog
Ruling on having a dog
Answer: Dogs are extremely naajis (impure, unclean).[...] Whoever keeps a dog in his house is denied the blessing of the angels [...] Keeping dogs nowadays is the habit of the kuffaar, who adopt them as friends, kiss them, let them lick them and their clothes, sleep with them and even leave them money in their wills. Keeping a dog is an imitation of the kuffaar.
I show this one as an example of the legalistic nature of Islam. You are denied blessing because you have a dog? The Islamic God judges people on whether you have a dog? It just doesn't make sense. God must judge purely on whether we do good or evil, whether we help others. That there even needs to be a ruling on things like this seems absurd to be honest. Besides, dogs can be such gentle and caring creatures. To hate them as much as the Quran does seems so, well, ungodly. Sounds more like whoever wrote on them being unclean must have been bitten by one at some point
.
Anyway, I hope I didn't offend anyone (I probably did though, for which I apologize
). But you asked 'why not', which kinda means I must sum up the negative. But at least this way you get some insight in the mind of a non-Muslim like me. It might help you when you are ever required to do dawah
.
I hope I don't get banned :-[ 
hew