Look, I think people sometimes make a mistake with term "Son of God". Though Christ is, he is also fully God, just manifested as man (just as the Holy Spirit, the helper, is also fully God).
Your comment about the Trinity not making logical sense made me chuckle. If God is really an all-knowing supreme being, would you really expect human minds to be capable of fully understanding such an entity? Herein lies the problem that most people have with faith, they can't accept that anything could be more intelligent or capable than man-- this of course makes no sense in light of the concept of deity.
I do agree that Muslims, Christians, Agnostics, Mormons, Taoists, Liberals, Conservatives and fans of ice cream should all join hands, practice actual love, and care for each other. My church actually has a relationship with a local mosque, not to blend our religions (that's cray, and makes no sense) but to serve together and embrace each other as people.
That said, your claim that Christian Faith and Islam are more simmilar than not, is false from a Christian perspective. You seem to not quite understand some of the theology: Christ said that no one comes to the Father, except through him-- through the law-breaking grace that he gave us by making a sinless sacrifice of himself. This is the main difference between Islam and Christ: in Christ I have grace from a loving God, so I don't have to be perfect (which I couldn't achieve anyway)! Good fruit and a desire to live a loving, God-honoring life comes naturally out of that freedom-- which is totally different than seeking to measure up, strive or attain perfection based on a legal structure (of sin). Christ defeated sin's power over us, and all we need do is claim that-- that's why, in Christianity, there is no "worst sin" because my God is bigger than any mess we humans could find ourselves in. Islam and Judaism are still slaves to sin, with no way to sustainably atone for it. And let's be real, you sin, I sin, we all are guilty of sin. Christ just provided an eternal solution. The Christian God sacrificed his own son for his people, Allah expects you to earn your own way (even though no one can ever attain perfection enough, to be in the presence of a holy God).
So bottom line: my God and your God have very different character traits, and we have totally different ideas about how one deals with the sin problem.
I think our religions (and all others, including people who choose to not engage with spirituality) should seek to treat each other with compassion and love-- I mean, that's what Christ calls his people to do. Still, that can totally be done without "combining" our religions (which is truly disrespectful of either side, anyway). To do otherwise would be to negate my perception of truth. That's silly, and I'd never call on anyone to do that.
