From spirituality point of view, the manifest physical human form does not carry much significance in the spiritual world, except for the fact that it is only in human form the spirit, soul atman within reaches state of absolute purity. Liberation from cycle of birth and death is not possible in lower forms of life. We must never forget that the manifest physical human form is but an interim arrangement for soul atman to purify itself. Other than this human form carried no value.
The human life is limited by only one manifest life, the present form. After death of present body the released soul atman would manifest a new body based on residual balance of karma at the time of death. This new form is not directly but indirectly related to the old form through common element, the soul atman. If human life is an interim arrangement for soul atman within, then it is not for human beings to question God Almighty.
We are born and we shall die one day that is the end of the spiritual story. After occurrence of death our soul atman shall again manifest a new body. This means the present human form is limited by 70 to 80 years of earthly life time. As ordained by god in present life time we can indulge in spirituality to reach cosmic end of life, become a pure soul atman or just while away present life time indulging in religious practices (rituals) that meant zero progress for soul atman within.
It is not for human beings to question God Almighty at any stage of life. The status of a human being compared to god meant nothing. As we are only an instrument in hands of God Almighty, it is in our interest to abide by wishes of God Almighty. And God Almighty desires every soul atman liberating self from cycle of birth and death at the earliest. Indulging in spirituality detailed in Bhagavad Gita we can exactly do that, reach state of self realization, god realization.
From the time life originated on mother earth for the first time, God Almighty ordained a long journey of 8.4 million manifestations for soul atman within before reaching state of liberation, regaining the lost original pure prime pristine primordial form. Out of 8.4 million manifestations initial 7.3 million manifestations occurred in insect, plant and animal life. In the remaining 1.1 million manifestations in human form one is expected to reach state of self realization.
As the journey of spirituality is long, God Almighty created almost unlimited desires and wishes for human beings to indulge. God Almighty also designed path of spirituality so that spiritual travelers like Swami Vivekananda can cut short the journey and reach state of self realization in their lifetime. It is a different matter that Swami Vivekananda did not do that even though he could have done it under the able preceptorship of Sri Ramakrishna Paramhansa.
Human beings reached stage of self realization after demolishing their ego in totality and finally overpowering five senses and mind forever. Control over five senses comes with time as human beings reduced their desires and wishes in stages. The spiritual progress is faster only if we possessed willpower exhibited by Swami Vivekananda.
As a human being there is no point criticizing God or questioning his authority! We have come on mother earth only for a limited duration, a sojourn limited by 70 to 80 years of earthly life. If we can indulge in spirituality in present life time, fine otherwise we can leave things to chance, the next manifestation by soul atman.
Why God creates entire cosmos, why we human beings exist is something not to be answered even by God himself. This is one question prohibited to be asked even in Bhagavad Gita.
We must simply remember, we exist not of our own yet we have to indulge in karma. In a way we can say life is imposed on us but if we were positive in life, we would enjoy every single moment of life rather than criticizing God, thinking about his doctrine of Maya (veil of illusion). If we go deeper spiritually we shall find that the whole cosmos existed only in thoughts of God Almighty similar as an image exists in mirror. This is what doctrine of Maya is all about.