Is drinking Coca-Cola forbidden because of what is said about seeing "No god but Allah, Muhammad" on the can in a mirror, and would its drinker cease to be a Muslim?

What has been said about Coca-Cola containing offensive writings when viewed in a mirror is incorrect and does not entail a Sharia ruling. One must avoid over-elaboration and attachment to illusions. The default ruling for all drinks and foods is permissibility unless their harm is proven, and they are not forbidden merely by probability or conjecture. However, if the producing company supports the enemies of Islam, then it is boycotted for that reason.