In Australia I would say the main motivation would be:
3) Remove any religious or Bible classes in schools.
Personally I would recommend Bible studies in school. Not a sanitised study led by the believers but a study of what is actually written in this hideous book. Reading the Bible was by far the greatest motivation of my atheist sentiments.
No person with any legitimate sense of morality could possibly read this book and continue to be ambivalent about Abrahamic faiths let alone argue that they have philosophical advice to offer humanity.
The only teachings the Bible has to offer is to show how easily so many people can be manipulated by self satisfied bigotry and fascist attitudes.