In her book Atheists Finding God: Unlikely Stories of Conversions to Christianity in the Contemporary West, Jana Harmon explored why atheists came to faith in Christ. One big factor included the kindness of Christians. Harmon writes:

Nearly two-thirds of the former atheists I spoke with thought they would never leave their atheistic identity and perspective. They were not looking for God or interested in spiritual conversations. So, what breached their walls of resistance? ... Something [disrupted their] status quo.

She shares one story about how some Christians became the catalyst that disrupted the atheistic worldview by Christlike kindness:

Jeffrey became an atheist following a childhood tragedy where he lost two brothers in a house fire. His deep pain fueled a vitriolic hatred against God and instability in his own life. During the next 20 years, he developed strong arguments to support his emotional resistance to belief. When his wife unexpectedly became a Christian, his anger against God only grew.

One evening his wife called and asked him to pick her up at the home of the Christians who had led her to Christ. Jeffrey was expecting a heated exchange, but instead received warm hospitality. Feeling valued, he was drawn back again and again toward meaningful conversation. Over time, his walls of resistance began to melt, friendship and trust developed, and intellectual questions were answered. Eventually, he lost his resistance to God and found the peace and joy that had long eluded him.