If you put your letter in bullet points make sure they are placed before you state you want to be DA. This will guarantee that they read the bullet points. You might want to use no more than half a dozen bullet points for your entire letter with the request for DA at the end.
Here's an example:
Dear elders,
- Because you have defamed Jehovah with continuous false prophecies.
- Because you have allowed pedophiles to remain in good standing in your congregations.
- Because you have taken away the most precious time of our children's and adult lives in order to serve an organization.
- ...
I have decided to disassociate from your organization.