Every human being has a conception of the supreme truth. That conception is presented in some concrete shape. If therefore the Mussulman or the Christian denies to chant the name of Rama or Krishna we may ask him to chant the name of Allah or God respectively and I think therefore there will be no objection even by the Buddhists if we simply ask them to chant the name of Lord of Buddha in the systematic way.
The systematic way means to avoid the ten different offenses in the process of chanting, which are all philosophical truths.