Read Matt. 10:32-33
This just in: the Bible answers the question about how converts in hostile countries are to bear witness to Christ: Publicly. That, at least, is what Jesus said in the first Gospel.
Underneath all the missiological mumbo-jumbo and artful dodges—often asserted by Western theoreticians ensconced by comfortable tenure, grants, and libraries—we ought not forget that our Lord answers this question in red letters. To acknowledge Christ means to be unashamed of him. Jesus thought that would be good for us in every generation and in every culture, even if persecution occurred. Calvin said that, “there is no believer whom the Son of God does not require to be his witness.”
– David Hall; A Place For Truth; “Update on the Insider Movement“