I am convinced that if you simple glorify Krishna and our books in the best descriptive manner anyone and everyone no matter even an atheist or otherwise can be conviced to purchased.
First take the science of God very seriously, then put your trust in Him.
Science of Self Realization, Chapter 6,
If you love Krishna in any capacity, you shall never be frustrated because everything in Krishna is perfect, eternal, blissful and full of Knowledge.
In order to be recognized by Krishna, the Supreme Personality of Godhead, one should chant the holy name of the Lord continuously, twenty-four hours a day.
Srimad Bhagavatam 4.23.7