@Wayne: a free piece of legal advice as I consider Harald Frank to be one of my "special friends": tell him to go stuff himself.
To the best of knowledge, "Amithlon" is not registered as a trademark in any European country (to the extent that this woudl even be relevant).
Moreover, your server is located in the States and geared towards an international, English speaking audience.
No German court can assert jurisdiction over it, he would need to sue you on the basis of an American trademark in an American court.
That ain't going to happen.