definition islam To Christian people

[hocine31]

Aslam alikom

I discuss Christian for islam
#He send me this meesage
I do not confuse the Arabs and Muslims, because this nationality and religion, as it can be confused. Just 95% of Arabs are Muslims. Muslims urged people of the Book, that is to unite Christians and Jews? They want to establish Islam around the world? so they cut off heads to children and adolescents? !!! I can not understand this religion ...
The Koran forbids to beat his wife "without reason"? That is so sweet and generous ... and if there is a base, it can kill? If a woman leaves on the street unaccompanied by her husband this is the reason for her being beaten?

What's the difference between Shiites and Sunnis? They're kind of two followers of the Prophet Muhammad?#

I want a convincing answer in English
Thank you