One who is a Muslim and then leaves Islam, there is a strong punishment for this act rather than accepting them as minority. This will not but allow them to create mischief like propagate there false doctrine. The authorities need to look after their decision.
Muslims do not need to fear any one except Allah. With his Divine help, only few of true Muslims can defeat HIS enemies. We Muslims must unite together, use faith as a weapon against transgressors. In Ghazwa Khandak, a strong wind blowed the enemy, so we have the biggest power with us only if we have strong faith.