We Japanese has 2 religions.
One is Shinto. In japanese, 神道= God（神） Cult（道）
Another is Buddism. 92% of japanese are said to be these 2 religion followers.
However, if you ask japanese that whether you have any religion or not, he will be in trouble to answer.
Most of us are Shintism or Buddism but we don't consciou of religion in daily life.
Nevertheless, we enjoy Christmas and Halloween.
There is almost no problem on Chrismas but in the case of Halloween day is different.
You will find the man very much excited and ulter harsh words to policemen.
This is one of the example of japanese idiot behavior on Halloween.
Place like especially Shibuya or Shinjyukku are crowded by drunk people. There happens fights and covered with trash.
This is Japan.