I've got some brochures for you here, but I agree with the others....your protest would probably be much more effective if you mainly discussed the planning issues. (Throwing in a few other opinions probably wouldn't hurt, but too many & they'll think you're a bigot, then discount everything you said.)
Questions you can ask at the hearing: Will the current roads be able to handle the traffic? Is there adequate parking to handle all the cars, including Memorial nights when it's busier? Have these issues been studied or professionally evaluated? How much of an an increased tax burden will be brought by this tax-exempt organization? Will the KH make a lot of noise that would disturb the neighbors?
If you're really diplomatic about it, you might be able to mention a concern that this organization known to hide pedophiles & how this will affect the neighborhood. They've even got a database of rapists they refuse to turn over to the police. Have you checked your local area to determine if there are alleged perps in your area? Silent Lambs has one database for the US; if you know names, you can check other databases. If you were able to mention a name of a convicted rapist, that would proably pique interest.
Good luck!