The power of Kalki Avatar lay in truthfulness and also Bhagavad Gita, the sermon given to mankind by Lord Krishna. The teachings of Lord Krishna in Bhagavad Gita are so powerful that even an ordinary mortal can reach stage of Mahavira, Gautama Buddha even Jesus Christ and Prophet Mohammed. From an ordinary mortal to a self realized soul, simply unbelievable!
Mounted with power of Bhagavad Gita and also Upanishads (independent spiritual treatises), Kalki Avatar would only bring about a drastic change in the thinking prowess of mankind. In a Kali Yuga (the present Dark Age) and particularly in a country like India almost 95 people indulged in negative practices, negative thinking and only 5% were pure on whom, rested the responsibility of 95%. Almost all were materialistic, inwardly practicing vice all the time.
In the aftermath of world war 3 when about 1200 million people lay dead, life would have lost its meaning. Almost 20% population of the world missing! The whole world would become a mass grave. The precipitation of world war 3 would be caused by mankind, a man-made tragedy and nature having nothing to do with it. But mankind would blame mother earth, natural calamities, never their bloated ego.
To assuage the hurt humanity, the teachings of Bhagavad Gita and Upanishads would act as balm. Mankind would finally realize their folly. The perception would overnight change from materialistic to spiritual. Earlier 95% people practiced negativity, materialistic tendencies and only 5% were pure but in the aftermath of world war three we shall notice 95% people practicing spirituality and only 5% hard-core human beings delving in negativity, materialistic tendencies.
For a normal human being, practicing materialism is never a taboo but for soul atman within, the spirit that manifested human form it was a very heavy price to pay. Every soul atman desires merging with God Almighty at the earliest, regaining its lost original pure prime pristine primordial form! 95% people practicing spirituality means ushering into Satyuga, the golden period.
The change of events would be so dramatic that everything would change almost in a fortnight.