Again, it's not "the Muslims". Or, at least not in the way you want it to appear.
The practice is more prevalent amongst the Muslims - I don't disagree. However, that by no means even begins to address the huge numbers in Hindu dominant nations.
India is 80% Hindu and 13% Muslim; Nepal is 81% Hindu and 4% Muslim. Both those nations are in the top ten for child marriages. Your own source states:
India, with a population of over 1.2 billion, has the world's highest total number of child marriages. It is a significant social issue.
You are not going to get that with just or mostly numbers from the Muslim minority.
Child marriages persist in rural India | Asian Tribune
Akhai Teej is a Hindu festival.
Rajasthan is 89% Hindu, Madhya Pradesh (91% Hindu), Uttar Pradesh (80% Hindu), Bihar (83% Hindu), West Bengal (73%, with the largest Muslim minority of these districts at 25%).
So...to clarify, here is my position, which I've modified slightly:
Child marriages are a serious issue in much of the developing world.
The causes are various and often intertwined: poverty, lack of education, culture, political instability and war, religious values, weak governmental authority.
I concede religion may play a greater role in child marriages when it comes to Muslim and Hindu communities in certain parts of the world.
When it comes to Islam, however - there is not a unified opinion among scholars as to the propriety of child marriages or the age of Aisha at marriage and consumation (I've supported this with multiple links). While Aisha's age is undoubtedly used in some regions to justify child marriages it is also bound up in cultural traditions and far more prevalent in rural, poorly educated and poor regions then in better educated urban areas regardless of religion. Ignorance, superstition, lack of women's rights (which extends to girl children) often go hand in hand with the most fundamentalist forms of religion.
Given the above, I strongly condemn those who attempt to smear all or even most of Islam and Muslims as a group as being supporters of pedophilia and child marriages. I firmly believe those who do can accurately be labeled "hate groups" who are less interested in resolving the issue then in demonizing Islam since, at least as is shown in discussions thus far - they largely discount what happens in the non-Muslim world and non-religious reasons for child marriages..
Wipe off the egg before it dries