I wish not to bring the sensitive subject of religion in this topic but a proper reply requires me too. My belief is not a fantasy but the teaching of Allah(swt) in one verse Allah stated the following,
"Haritha was martyred on the day (of the battle) of Badr, and he was a young boy then. His mother came to the Prophet and said, "O Allah's Apostle! You know how dear Haritha is to me. If he is in Paradise, I shall remain patient, and hope for reward from Allah, but if it is not so, then you shall see what I do?" He said, "May Allah be merciful to you! Have you lost your senses? Do you think there is only one Paradise? There are many Paradises and your son is in the (most superior) Paradise of Al-Firdaus."
According to Allah a shaheed has a place in heaven waiting for him. Please don't think that's Isis or other extremist groups recieve the gift of paradise.