Answers in Genesis founder and CEO Ken Ham is blaming those in their 20s, or the Millenial generation, for the spiritual decline in America, saying their lack of faith in the Bible and belief in evolution have caused America's religious fervour to drop significantly.

"As Scripture reveals, it can take only one generation to lose a culture. Today, we certainly witness the loss of the once predominantly Christianised worldview in our society. The detailed research we conducted through America's Research Group ARG (and which confirms studies by other groups) makes it very clear that the beliefs of the 20s age group have created a tipping point in the culture," he wrote in his blog.

According to the ARG, over 40 percent of Millenials who regularly attend church do not consider themselves as born-again Christians. Over 20 percent of them left school believing that the Bible was less true, over 45 percent said they were not taught to defend their faith in Sunday school, and 45 percent believe that homosexuality is not a sin, among many other things.

"Now, our research also showed conclusively that the issue of the age of the Earth/universe was one of the major factors causing this generation to doubt that the Bible can be trusted," Ham added. "Don't you just sigh when you read statistics like the ones above? Aren't you deeply troubled and tremendously burdened about the Millennials who attend our churches?"

In comparison, 86 percent of churchgoers in their 60s strongly believe that Noah's Ark was real and was actually built, while only 52 percent in their 20s think so. At the same time, only 34 percent of Millenials think that the Christian faith is currently under attack in America.

"There is much more revealing data that offer sad results that came out of this national study. There is no doubt that those in their 20s — both inside the church and out — are much more secular in their thinking and actions than previous generations," Ham said.