Are you a Christian if you are christened even though you don't believe in God?

It is an interesting question. You might say that you are nominally Christian by virtue of your upbringing, but you are not a Christian in the more formal sense of devotion to Christ.

ANSWER 2:

Someone who doesn't believe in God is called an atheist. No one can be a Christian and an atheist at the same time. To be a Christian, one has to believe in Jesus as the Son of God.