The overwhelming majority of white, evangelical working-class evangelicals believe that Christian values are under attack in America, a new poll has revealed.

The CNN/Kaiser Family Foundation survey found that 90 per cent of that group shared this view. It was also common among mainline protestants (73 per cent) and Catholics (61 per cent).

Just 41 per cent of people who identified with no religion believed Christians values are under attack, however.

The poll also found that more than three quarters (76 per cent) of while, working-class evangelicals said they would consider voting for Republican presidential nominee, Donald Trump.

Three in four (75 per cent) said they believed that recent immigrants from Muslim-majority countries increase the risk of terror attacks in the US.

Trump has campaigned hard for the evangelical vote, promising to repeal the Johnson Amendment, which bars churches and other religious institutions from engaging in political advocacy.

Last month, he claimed that "Christians have been silenced like a child" in modern America, and pledged to "get [their] voice back".

He has also promised to make dramatic changes to US immigration policy, including by developing a screening test to combat the threat of Islamic extremism.

Having previously called for a temporary ban on Muslim immigrants to the US – a move which was widely criticised as Islamophobic – Trump said that applicants would be tested on whether they "share our values and respect our people".

The Republican candidate has been backed by a number of high-profile evangelicals, including President of Liberty University Jerry Falwell Jr, and Robert Jeffress, pastor of First Baptist Church.

He has been roundly criticised by other Christian leaders however, such as president of the Southern Baptist Convention's Ethics & Religious Liberty Commission, Russell Moore, and former US President Jimmy Carter.