As a youth and Asia Indian (Tamil), I have been taught to respect elders. That means anyone older has to be accorded a higher consideration than a younger person. In other words, we assume that the older person has lived longer and could infact (benefit of the doubt) has more experiences and must be given due respect through this.
Now, in deference to this, Christianity (2000 years now) one can say are believers of Jesus as Son of God ie (begotten of the Father;not made) thus is an older and more experienced entity (for lack of a better word), and traces its heritage (in belief) to Jesus (born of a virgin –Mary) who was betrothed to Joseph (living in a Jewish custom and all that goes with it) who came in the fullness of time to reveal the One True God.
Meanwhile, Islam arguably 600 years younger also have a serious affinity (for lack of a better word again) with this man Jesus who is son of virgin Mary and -Im not an expert in Islam- but Islam I think has no history of Joseph for whatever reason.
Now back to respect. Personally it is my wholehearted wish that respect be accorded recognition and with that this means there should be a benefit of a doubt that Jesus is indeed (son of Mary-betrothed to Joseph ) and God’s Son, begotten not made. This also means that there is no reason why Christianity would have made this up because it is The Way, The Truth and the Life. Christians really do want to love and love truly themselves and their neighbor;nothing less.
What are your views on above and whether it is fair or unfair for Islam and their adherents to accede to the Christian Jesus benefit of the doubt.
Be careful though (and I hope I have not crossed the line) between proselyting and evangelizing. I believe and hope to be construed to have done the latter.