I have been asked to be a godparent to my nephew. However, I'm not a Christian. In a Church of England ceremony, what exactly is asked of the godparents?
In the Church of England you need to be able to answer the questions asked of godparents truthfully and sincerely:
Those may not be too bad: even a non-Christian theist might pray for a child and help them take their place in the Church, and support them in their pilgrimage of faith.
The next set of questions might be more of a challenge to a non-Christian.
In my [former] Church of England parish, a non-Christian would be advised to think seriously about whether he could sincerely answer these questions, and to consider whether he might do more service to the child’s faith by acknowledging how serious they are, by refusing the invitation in conscience.