Perhaps we can make fanciful use of "church attendance statistics" to answer this question.

Many Buddhists have equally strong ties to the Confucian and Taoist1 traditions.2 Perhaps when they go to the office, they shift gears, and say, "That was Zen - this is Tao."3

  1. Not to mention Shintoism, shamanism, or animism.

  2. This kind of syncretism is a well-established phenomenon in east Asia, which of course is home to the vast majority of Buddhists.

  3. Of course, some religionists regard Zen as a separate tradition from Buddhism, and Zen Buddhism as syncretistic practice in its own right.