I don’t think the word collectivism means what you think it means.
Islam lived by plunder, taking other people’s stuff away from them. Much as the Roman Republic and Empire did. And the robber barons of the Middle Ages, etc.
That’s a very different concept from collectivism.
Noun
The practice or principle of giving a group priority over each individual in it.
The theory and practice of the ownership of land and the means of production by the people or the state.
Islam is about establishing Muslims as a ruling class over the rest of us, not about collective ownership by all.