We are having a Greek Orthodox wedding in a church.
Do I have to have a wedding at the municipality or not for it to be legal? I get different answers off everybody

My theory after research is this: Before we get married, we submit a wedding application at the municipal offices....we bring passports, proof of single status and birth certificates. Because we are getting married in a church we also get a 'form b'. We don't need to have another weddin ceremony.
Any ideas appreciated!
Thanks,
Eracles