What is the larger group of Muslims?

Shiites or the Sunnis

Is the Shiites the largest group?

http://www.religion-cults.com/Islam/islam5.html

This seems to have been updated last in 2006, but I doubt the proportions have changed very much.

Sunni makes up the peaceful majority by a vast margin. Shiites are the not so peaceful minority.

The larger group of Muslims is the Sunnis, not the Shiites. To confirm this information, you can refer to various reliable sources such as demographic studies, surveys, or scholarly research on Islam. These sources often provide data on the distribution and population size of different sects within Islam. Additionally, you can consult reputable encyclopedias, books, or online platforms that specialize in providing accurate information about religious groups and their demographics.