Peter Leadbeater took two days to complete the work, which stands next to the garden of remembrance.
The church says the idea came after it had to get rid of 24 trees in its grounds for safety reasons.
An eight foot section of trunk was left in the ground for the artist to work on after a donation from a member of the congregation paid for the creation.
Vicar Jo Stephens said: "We are delighted with the new sculpture that Peter has masterfully crafted for us. We now have a sculpture of the Holy Trinity quite literally rooted into our church grounds and available for everyone to come and see and reflect upon.
"We are sure this will be a focal point for our church family and the local community for years to come. People visit the garden to reflect and remember and we hope the sculpture will add to that experience. It has been designed to appeal to Christians and non-Christians alike.
"We spent a little time with Peter to decide on the form of the sculpture - it was important that it offered something to reflect upon as people enjoy the open space of our church grounds, or as they visit to remember a loved one.
"I am sure that all people will find the sculpture beautiful and reflective, whether they have a strong faith or little knowledge of Christianity. For us the orb at the top of the sculpture reflects God the Father, the creator of all things, without beginning or end. The person of Christ within the sculpture is purposefully simple so that people may reflect on their own image of Christ. The Holy Spirit is represented by a flying dove."