In my own experience, people in Japan seem so completely and totally ignorant of any coherent form of religion that it is a complete non-presence in society.

As in, people are aware that there are monks and temples, but not really sure why, and they don't care.  It's common to be against killing bugs, but totally okay with eating meat, and totally unaware of the religious origin of their aversion.

Even those who are seriously into traditional festivals and ceremonies view them more as a hobby, something to do, than in any way that is recognizably religious.