Christ said, "By their fruit you will know them." He was expecting His followers to practice Godliness (God-likeness/Christ-likeness) as a means of drawing others to the Father. There is nothing in Islam's current practice (or its practitioners) that would so draw a person. This being the case, the Islamist brandishes the sword and sighs, "Oh, well..."
"Peace I leave with you. My peace I give to you; not as the world gives do I give to you. Let not your heart be troubled, neither let it be afraid." - John 14:27
Another "red flag" is that there is not one place in either the Muslim Qur'an or even in the much later made up Hadith's that teaches Muslims to have a loving relationship with Allah. This Allah is to only be feared by Muslims. Will all Muslims go to Hell? According to Sura 19:71 every Muslim will go to Hell (for at least some time), while another passage states that those who die in Jihad will go to Paradise immediately.