But when people started asking him difficult questions about God and the Bible, he started struggling — there were some questions he couldn’t fully answer.

“I won’t say I felt guilty,” he said. “But I felt like I wasn’t giving sufficient answers.”

Soon, he just couldn’t handle it anymore.

“It was a rapid ascent — I won’t say decline — to my atheism from that point on.”

Now, he’s on a different mission: Get atheists into church. But it’s not what you might think.

Testerman is the founder of Free Thought Exchange, a Denver-based organization created within the past two years to foster dialogue and understanding between Christians and atheists.