Highest proportion of Muslims

According to Official Guinness Records,

Afghanistan is the country with the world's highest proportion of Muslims, with 99.7% of the population following Islam.

For a complete list of 2011 records, please visit 2011 Guinness Records in Afghanistan.

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Other Afghanistan records that might interest you:

• Most foreign troops deployed in a single nation
• Longest Afghan war
• Largest heroin seizure
• Highest winning margin in Mario Smash Football (Nintendo, 2005)
• Largest producer of cannabis (country)