Yes, Islam disputes the idea of God having children. However, the status of Jesus as Messiah is an essential part of Islamic doctrine.
1 John 2:22 Who is a liar but he that denieth that Jesus is the Christ?
Muslims do not dispute that Jesus is the Christ. Christ in Greek means "the Anointed". We agree.
As far as your translations of the Koran which you have posted to show the strict monotheism of Islam, you are absolutely correct. The Koran says that God sent the Holy Spirit into Mary the Immaculate to conceive Jesus the Christ (as a mercy to mankind).
So, now you choose to call him the son of God and God's equal. Yet, Jesus never called himself God or claimed to have created the universe.
In any case, when Jesus returns, I'm sure he'll take some time to straighten out any misunderstandings. Yours as well as ours.
So, may God be with you.