[Mind's Eye] Should Atheism be promoted

I do not believe that a supreme being created the universe etc.

Until today, I have accepted the existence of religions on the
grounds
that they give hope and faith to many in the face of adversity and
promote certain moral values.

This week A C Grayling brought out his book "The Good Book - A
secular
bible". In interview he stated that theism is harmful to individuals
and society. Although his thoughts on this were nor expanded.

I live in Fiji and cannot get a copy of his book but I would like to
hear his argument on this matter. Ie Why he thinks that theism is
harmful.

I have found nothing of depth on the web.

If he is indeed correct then there is an argument for the active
promotion of atheism. Perhaps we can become missionaries in the human
cause.

What say you?