Brian McLaren has decided to celebrate Ramadan this year:
This year, I, along with a few Christian friends ... will be joining Muslim friends in the fast which begins August 21. We are not doing so in order to become Muslims: we are deeply committed Christians. But as Christians, we want to come close to our Muslim neighbors and to share this important part of life with them.
You can read the rest at Brian McLaren's blog, but I want to ask, could this be a case of offering food to idols (or in this case foodlessness)? Or is it contextual witness?
Before answering, consider the Shahadah, “There is no god but Allah and Muḥammad is the prophet of Allah.” What would contextualisation look like here?