There are substantial networks of Christian schools associated with the Christian churches and also some that operate as parachurch organisations. The Catholic education system is the second biggest sector after government schools and has more than 730,000 students and around 21 per cent of all secondary school enrolments. The Catholic Church has established primary, secondary and tertiary educational institutions in Australia. The Anglican Church has around 145 schools in Australia, providing for more than 105,000 children. The Uniting Church has around 48 schools as does the Seventh-day Adventist Church.