The accusation of dawah team against the Bible regarding the destruction of Amalek is invalid. What YHWH did in commanding the extirpation of the Amalekites was a judgment upon a vicious gang of murderous enslavers. This was no ethnic or religious pogrom or genocide, like the IS massacres of Alawites and Shia; rather, it was the punishment of a violent robbery gang, engaged in slave-raiding.
Just as popular opinion across the world was revolted by the massacres of innocent people and organised rape of Yezidi girls by IS such that they demanded the destruction of such a malicious entity, the same was true of Amalek. Also, the contrast between the Hadith and the Bible on the issue of massacre is clear. The Bible records the command to destroy a gang of incorrigible thugs, not innocent civilians.