There’re lots of people who are Christians. Christianity seems to be the fallback position. It holds a belief and that belief is key to the way one lives. I don’t think it holds the position that life is empty. If you aim to be a spiritual person without recourse to Christianity, then you may feel more akin to Eastern philosophy. In which case you would hold emptiness to have value, like a vase or a container. There is a pathway there too. In your poem, make some kind of value statement.