Churches are generally open to everyone that wishes to attend their services. Being a member of the faith is not always necessary. There are no door wardens to require people prove they belong to any particular faith at all. Churches have this policy because they want people to attend services and learn about their faith. The open door policy has long been in place and shows no signs of ever changing.
Participation in some church events is restricted to people that have officially joined the faith. A person cannot be a Godparent if they are not a member of the faith. Being an official member of a faith generally means a person has been baptized and confirmed in that church’s faith. Church records are used to certify that this is the case. While some roles have been restricted to those officially of the faith, attendance at the ceremonies is generally still open to all.