You are absolutely misinformed regarding this, conversion was not only allowed but loved by muslims, as it is one of the most important duty of a muslim to call others for the religion of Allah. However as it is also stated in the Qur'aan, none can be forced to convert, so those who preferred to not convert from the Christians, Jews and afaik magians were considered as dhimmies, whom the islamic state protected and in return they payed tax (since they anyway did not join the army in case of war).
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