If Allah (SWT) had willed He would have and could have sent a messenger to every town instead of sending Prophet Muhammed (PBH) as the last messenger for all human beings till the end of the world. In view of this, we, his followers, should not obey the infidels but strive against them sincerely to convey to them the final message (The Quran) through our own example or through preaching, ofcourse after practicing.