Allah, the exalted, says in the noble Quran as such:
مُّحَمَّدٌ رَّسُولُ اللَّـهِ ۚ وَالَّذِينَ مَعَهُ أَشِدَّاءُ عَلَى الْكُفَّارِ رُحَمَاءُ بَيْنَهُمْ ۖ
Muhammad is the Messenger of Allah; and those with him are forceful against the disbelievers, merciful among themselves .
While we know who Qur'an regards as Kafir, how can the Muslims be "forceful" among disbelievers and "merciful" among themselves in the modern world which is referred to as the "Global Village"?