If you are a an existing ASH Practitioner and lost or never received your account information package please contact a customer service rep at (800) 972-4226 for assistance (see other numbers below if your speciality is not Acupuncture). Alternatively you can also email a ASHLink customer care agent at service@ashn.com.
If you're looking for the church that is closest to the Catholic Church in terms of doctrine and practice, that would be the Eastern Orthodox churches. Even the Lutherans are far closer to the Catholic Church than the Methodists.
The closest thing the Roman Catholic Church has to a unique symbol that is only for the church is the Papal Insignia-crossed keys. See related links for an image of this. Most Catholics and almost all non-Catholics would be unable to recognize or identify this symbol.