Hinduism also talks about one god.you reincarnate when u are not clean and with desires and sins . Ultimately you will go assimilate to the god. We do not burn bodies to clean them we believe that body is made of elements air,water,earth ,sky and fire .our cremation brings these elements to where they belong to . It just means that soul is immortal body is just elements where they go where it came from.please understand hinduism in detail not just the shallow part and u will understand it is no diff that what u practice.