People don't look at this logically. They look at emotionally. For if they looked at it logically they would know that Islam and Christianity do not lead to the same God. For if they were, why is it that if I go to a Muslim country and preach the God-man crucified for the atonement of sins I am beheaded?
Or how can it be the same since Islam has its roots deep in worshiping Allah, the moon-god, thus the praying towards Mecca which is where the temple of the moon-god was, and celebrating Ramadan, which marks the rise of the crescent moon depicted on the Muslim flag, whereas Christianity worships the God - of - the moon?
http://www.acommonword.com/
Sadly many Christian leaders swallowed that bait and surrendered Jesus Christ in the process.