Maybe we do not understand all these rules, but we accept them as a part of faith.
We understand these rules and we see the wisdom for them. Right now, you do not just like a person who has never needed to use "km/hr" will not see the wisdom in such a feature.
But sometimes I feel like "How can I believe in a God that permits hitting your wife"
If that's what you're thinking then you are totally distorting the issue once again. You make it seem like some blanket permission to hit whenever you want, and that is totally UNISLAMIC. The correct statement would be "...a God that permits hitting only in cases of manifest indecency when it will prove productive, and only after all other methods, such as dialogue and seperation, have been exhausted." As soon as you put it into perspective, your objections dissolve.
"Why would God let men have 3 more wives even if the first one would be really upset?"
If the first wife doesn't want it then God has given her the ability to simply stipulate it in her contract and then he will not be able to marry another wife. If people follow the sunnah of the Prophet Muhammad pbuh and follow his teachings on kindness, love and compassion for one's spouse they will never fall into anything that is cruel to her or unfair.
Maybe this is just my test from God? Maybe its Gods way of telling me that Islam is not for me?
Would God ever tell one that submission and devotion to Him alone is not for one of His creation? That would be manifest injustice, and God is never unjust. Use the reason and understanding that God has blessed you with and you will see that the Islamic creed on belief in God and His Messengers is the clear and truthful path.
focus on the proofs of that the Quran is from God, rather than evaluating its content, based on my own morals.
But right now you are not even evaluating its content fairly. You aren't studying the message of the Qur'an in terms of monotheism, prophethood, the hereafter, etc. You are getting hung up on tabloid issues which are truly trivialities. Think about this thread, it is an entire discussion on just one word in the whole Qur'an, and even still you don't have a rational objection to it, you just admit that you don't know any cases where you would see such a step as effective. That's no reason to throw away such a magnificent gift! The gift of Islam!
When you are taught your whole life, don't hit women
Islam does not contradict that. Islam commands men to be loving and compassionate to their spouses and never abusive and to follow the lofty example of the Prophet. You are twisting and distorting a dispensation in one specific particular case of manifest indecency and even then only when it will prove productive. So the contradiction with your values actually does not exist here, it is but a figment of your imagination.
This is actually what most muslims practice and if one follows the teachings of Islam they will never do anything that is unjuts or cruel to their spouse, so again you are creating a conflict where there shouldn't be one.
men and women should be equal partners in a marriage
No conflict here either, Islam says that men and women both have equal status before God and they have complementary roles.
http://www.load-islam.com/artical_det.php?artical_id=793§ion=family_society&subsection=Women
And I am absolutely disgusted by your example on baby killing. How on earth can any sane person compare one one hand a non-violent, non-harmful, non-painful method of countering manifest indecency when it will prove productive, to infanticide on the other hand?!? This is abhorrent killing of innocent lives, which Islam prohibits! What kind of perverted logic places dealing lovingly and justly with one's spouse in the same boat as slaughter?! If we were talking about domestic violence and wife abuse then maybe such a comparison would be more appropriate, but I have clearly shown that Islam gives NO licence for any kind of domestic violence of abuse and it rejects such things completely! Your objection to this issue was not that you thought it was abusive or cruel, but you just didn't see the usefulness of this kind of 'tap' in such a situation. So then you should compare it to "km'hr" on a car, something harmless that you don't see the use for. Not the slaughter of innocents!! You have some serious re-thinking to do if you that is how little you understand about Islam's teachings on marriage. Contemplate the following teachings of the Prophet on marriage and then you will see how ludicrous and baseless the comparison of Islam's teachings on marriage to infanticide is:
The Prophet said: 'The best of you is the one who is best to his wife. I am the best of you to his wife and I'm the best to my wife.' (Sunan At-Tirmidhî, Sunan Ad-Dârimî, Sahîh Ibn Hibbân)
The Prophet said: 'The most perfect of the believers in faith are the best of them in moral excellence, and the best of you are the kindest to their wives. (Sunan At-Tirmidhî)
The Prophet said: 'None but a noble man treats women in an honorable manner. And none but an ignoble treats women disgracefully' (Sunan At-Tirmidhî)
The Prophet said: 'I command you to be kind to women.' (Sahîh Bukhârî)
The Prophet said: 'The believer should not harbor hatred towards his wife. If he dislikes something in her, then surely he will be pleased with another quality in her.' (Sahîh Muslim)
The Prophet said to Abd-Allah ibn 'Amr ibn al-'Aas, who used to fast all day and pray all night: 'Do not do that. Fast and break your fast, pray qiyaam and sleep, for your body has a right over you, your eyes have a right over you, your wife has a right over you and your visitors have a right over you.' (Sahîh Bukhârî, Sahîh Muslim)
A'isha, the wife of the Prophet, was asked, "What did the Prophet used to do at home?" She answered, "he kept himself busy helping the members of his household, and when the time for prayer came, he would go out for the prayer". (Sahîh Bukhârî)
The Prophet said: 'Verily among the most evil of people with Allah in ranking on the Day of Resurrection is a man who goes to his wife and whose wife goes to him, and then he spreads her secrets.' (Sahîh Muslim, Musnad Ahmad, Sunan Abû Dawûd)
The Prophet said: "Iblîs (Satan) sets up his throne on water, then he sends out his armies of devils (to incite humans to do evil). The closest to him of these troops are the ones who cause the most tribulation. One of them comes and says, 'I have done such and such.' Iblîs says, 'You have not done enough.' Then another one comes and says, 'I never left him alone until I created trouble and caused division between him and his wife.' Then Iblîs comes close to this devil and says, 'How excellent you are!' " (Sahîh Muslim)
The Prophet said: 'If any man shows patience with his wife's bad temper, Allah will give him a reward similar to the reward of Ayyub (Job) for his patience, and if any woman shows patience with her husband's bad temper, Allah will give her a reward similar to the reward of Asiyah daughter of Muzahim, the wife of Pharoah (Cf. Qur'an 66:11).' (Al-Kabâ'ir of Adh-Dhahabî)
The Prophet said: 'Consult with women. Indeed, you have some rights over your women and they have some rights over you. It is their right on you that you provide for their food and clothing generously, and your right on them is that they do not let anyone whom you dislike in the house, walking upon your floor. (Sunan Ibn Mâjah, Sunan At-Tirmidhî)
The Prophet said: 'The most perfect believers are the best in conduct and best of you are those who are best to their wives.' (Musnad Ahmad)
I hope you can see now how bad of an analogy that was. No religion on earth has as many exhortations, commands and orders to men to be loving and compassionate and fair to their spouses as Islam does. Will you spurn the beautiful religion of God for some misguided path?
I'll continue the discussion on polygamy with you in the other thread.
Regards