That's a good point, i wonder if we've ever known. Nevertheless forced conversions are not lawful in this country& are stupid anyway because how can something forced be genuine. The Roman Emporer Constantine (the Great) in the lVth century decided, as he'd become Christian, everyone else had to (that is debatable, I've heard different opinions)!
All I can say is atm no-one can force me to join or change religion. No law against against anyone trying to persuade but I have choices.