The text offers a specific guarantee to those who die fighting:
Surah 47:5-6:
And those who are killed in the cause of Allah - never will He waste their deeds... He will admit them to Paradise, which He has made known to them."
In orthodox Islam, assurance of salvation is notoriously difficult to attain because of verses like Surah 46:9 (where Muhammad does not know what will happen to him). However, Surah 47:4-6 provides a glaring exception: dying in Jihad.
This creates a transaction-based salvation model where human blood (shed in battle) replaces the divine blood of Christ. A polemicist can use this to show that the Quranic path to guaranteed paradise requires taking or losing life in warfare, whereas the New Testament path to guaranteed salvation requires placing faith in the life that Christ already laid down voluntarily.