[Ali Imran]

Muslims generally don't believe in the triune Godhead. You're a very orthodox Muslim, and since you can't imagine one God in three persons, you often strike a discordant note, interpreting the verse as 'only one God' (the Father) - while omitting the Son and the Holy Spirit - just to suit your book. (the oneness of Allah)

Not just the Muslims. The followers of Judaism also don't believe that God is a Trinity. Ask Rabbi Tovia Singer if you don't believe me.

I heard Hindus have the same belief. They believe God is a Trinity, albeit a Trimurti. You have no reason to doubt the faith of the Hindus because they also believe God can incarnate into a man, just like your faith.