I note that the Australian Christian Lobby states :
"- That 12.7 million, or 64% of Australians declared themselves as Christians in the 2006 ABS Census.
- That over 2 million Australians attend a place of worship every Sunday"
That means that a mere 10% of the Australian population attend a church weekly. Some the 64% who classified themselves as Christians name themselves as Christians because that is the religion they were brought up in. Most never attend church, don't read the bible, don't think much about their particular denomination or Jesus or God and don't adhere to the man-made dogmas of their denomination.
When Christians want to add people to their church denomination they have extremely strict rules as to who is acceptable and a "true Christian". When they want to lobby politicians to support their causes then they add any person who claims to be a Christian. Quite strange!