You are wrong about Islam being 1400 years old only. The word "Islam" has five meanings I think but the major one means "Submission" to the will of God. It started with Adam. All religions have their roots in prophetic message that was Islamic but over time got corrupted by additions, exemptions, loss of scripture and death of knowledgeable people of that faith. There was renewal of the message always in the form of prophets appearing and clearing up confusions and ignorance., Islam follows that tradition and the Quran itself says it is here to correct mistakes of other religions and to support previous prophets and messengers, therefore, Islam was and is mankind's religion.
Also, Islam has practical social applications that are necessary for all times. Justice, truth, equality, responsibility, freedom of conscience, standing up for yourself and for others who are weak, the lsit is too long of what you find in Islam that modern societies require to function cohesively. Pick and choose.