Belgium: Catholics Take a Stand Against Church Attendance Restrictions in One of the World’s Biggest Churches Even though Brussels’ Koekelberg basilica is one of the largest churches in the world, Belgium’s COVID-19 restrictions dictate that no more than 15 individuals can attend service in the building at one time, Reuters reports. The same 15 person limit is being applied at much smaller parishes in the country, leading to confusion and outrage among Catholics who say a larger church should be able to allow more parishioners.