100%, full kundalini awakening is a prerequisite to attaining moksha salvation as detailed in Bhagavad Gita, the sermon given to mankind by Lord Krishna in the battle of Mahabharata.
A soul atman reaches state of moksha salvation in absence of dross impurities within. For removing dross impurities within soul atman human beings have to indulge in path of spirituality detailed in Bhagavad Gita. Demolition of ego in totality is also an absolute must.
Complete removal of dross impurities requires human beings negating karma to zero. This becomes possible when human beings reduced their desires and wishes in stages finally overpowering five senses and mind.
By practicing absolute celibacy for a minimum period of 12 years in continuation human beings finally succeed in full awakening of kundalini shakti, the coiled Serpentine energy lying dormant in base of spine. Full awakening of kundalini results in full activation of brain 100%.
Normal human beings used their brain 1 to 2% the remaining always lying dormant. Full awakening of kundalini recharges the brain to full 100% capacity. One immediately becomes an enlightened one, a bodhi, a Jina… a Mahavira forever.
In absence of full activation of brain 100% a seeker could never reach state of enlightenment followed by moksha salvation. All enlightened ones like Mahavira; Gautama Buddha even Jesus Christ and Prophet Mohammed after reaching state of enlightenment used their brain 100%.
Spiritual journey was all about removal of dross impurities within a soul atman. Of its own no soul atman can purify itself. It needs a medium, a body to work out its karma. The human form is only a medium for soul atman within to reach state of absolute purity. Human beings indulging in spirituality and finally reaching state of enlightenment followed by moksha salvation are a requirement of soul atman within and not the manifest physical human form.