In the name of God, Most Gracious, Most Merciful
peace be upon you,
The Islam of today has been subverted like the other religions, Satan succeeded in making them idolize a creature Muhammad (same like the Christians idolized Jesus) and follow a man-made book of laws called Hadith (an Arabic words that means 'sayings') instead of Quran.
These sayings are falsehood attributed to Muhammad, in these books alone (and not in Quran) you may find the call for violence, bias against women and dogs, stoning...etc
The punishment for adultery in Submission (the original of Abraham) is mainly the public witnessing of 100 symbolic lashes for the adulterer and the adulteress, thus social exposure is the deterent. The barbaric stoning practices are not authorized by God.
We shouldn't base our judgment of a religion on the distortions that have accumelated over hundreds of years, i recommend reading the final testament for yourself, only then you can judge.
Read the authorized english translation of Quran by the messenger Rashad Khalifa HERE
[24:2] The adulteress and the adulterer you shall whip each of them a hundred lashes. Do not be swayed by pity from carrying out GOD's law, if you truly believe in GOD and the Last Day. And let a group of believers witness their penalty.*
"24:2 Social pressure, i.e., public witnessing of the penalty, is the basic punishment (see also 5:38). The lashes shall be symbolic, not severe." Rashad Khalifa
One more thing, also if you want to be honest, refrain from repeating the false stories intended to assail the caharacter of Muhammad,character assasination was never a good way to discredit a dogma, question the message not the person. And again in order to have a fair judgment read the book he delivered for yourself.