Turkey is officially a secular country. But 99 percent of the population is Muslim. Many of these people are deeply religious.
The country’s atheists -- those who do not believe in God or gods -- say they have started to feel increasingly threatened and unsafe. They say the country’s pro-Islamist government has caused a rise of intolerance towards atheists.
Onur Romano is a leading member of Turkey’s Atheism Association. Every day, he opens the office and checks the mail. It often includes frightening messages.
"Sometimes they send photos of some al-Qaida members chopping people’s heads off and putting all the heads in a bucket. They tell us that your head is going to be in one of those buckets one day. That's how you are going to leave your office, stuff like that.