Why I am still a Christian.

[CBA222]

God exists but not as a being. He's a personified metaphor for goodness and truth.

He therefore exists as a concept or conception of your mind, he does not exist in reality. You are an atheist.

As culture, religion is based on tradition. Truth is not the issue.

Then what is the point of religion? It is a very personal matter and a serious commitment, it's not something you just do because everything around you does it.

Also from your own church.

"Of the doctrine of the Church of England" (Canon A5): "The doctrine of the Church of England is grounded in the Holy Scriptures, and in such teachings of the ancient Fathers and Councils of the Church as are agreeable to the said Scriptures. In particular such doctrine is to be found in the Thirty-nine Articles of Religion, The Book of Common Prayer, and the Ordinal."

This proves your Church believes in at least some parts of the Bible and therefore God, but you don't.

My vicar warns me to be careful of fundamentalists and atheists who will say I'm not a Christian.

Does your church actually teach that God is not a being and the Bible is not to read or relied on?

Religion is an ASPECT of culture

As said, Religion is a personal thing and involves serious commitment, it is not something you do to fit in.

Of course I do. I know I am a Christian and a pretty devout one too considering my service to the church since I was 5.

I would consider a devout Christian one who serves God(DO NOT GIVE ME ANYTHING ABOUT WHETHER GOD EXISTS OR NOT), not necessarily the Church.