I've put my thoughts on this topic into the form of a letter to be sent to organizations, such as website, that use the BC/AD convention. Feel free to copy it off and send it to website owners. One website at a time will make a difference.
I would like to suggest a small change for your organization. I see that you use the designation A.D. for your dates. I'm sure you know this is the phrase Anno Domini, Latin for "In the Year of Our Lord." On your website, you have referred to 2000 A.D., which implies that you consider Christ to be your Lord.
I understand this may not be the case, and that you may merely be following western cultural tradition. I also understand that it may not be practical for you to follow the Islamic custom of numbering years because it would not be understood by your English-speaking audience, or Chinese custom, or Jewish custom, or others.
My suggestion is the convention "Common Era" and "Before Common Era." The designation uses the Gregorian calendar reference (e.g., this year is 2000 C.E.). The change may seem superficial, but three points make the change worthwhile. First, the convention is known. Most have seen the convention, but even those who have not will not be confused. Secondly, the A.D. and B.C. references are incorrect because modern historical evidence shows that Jesus was actually born somewhere between 6 and 7 B.C.E. This lends legitimacy to your change because C.E. and B.C.E. actually refer to correct dates. Finally, western society is overrun by Christianity and, even in this small way, we who have differing religions and world views can seek to overcome passive oppression of our beliefs.
If you have any questions or require any evidence or further support for anything I've said, I will be happy to provide it. Thank you for your time and good luck in your efforts.