Members of the Jewish gay and lesbian association wave rainbow flags with the Star of David, during the lesbian, gay, bisexual and transgender (LGBT) visibility march, the Gay Pride, under the rain, on June 28, 2014 in Paris. AFP PHOTO / DOMINIQUE FAGET (Photo credit should read DOMINIQUE FAGET/AFP/Getty Images)

Religion has not always been kind to the LGBT community. Signs like the one ATLAH Worldwide Missionary posted outside its church in Harlem, New York capture the discrimination many LGBT people have faced in religious congregations -- and it is not hard to see why a significant number of people are leaving religion over anti-gay policies.

LGBT adults in the U.S. are considerably more likely to identify as non-religious than their non-LGBT counterparts, Gallup found in an August 2014 survey. Forty-seven percent of LGBT adults say they are non-religious, compared to 30 percent of non-LGBT adults, and the difference only increases between LGBT women and non-LGBT women -- 46 percent to 25 percent, respectively.

Gallup identified the highly religious as those who say religion is an important part of their daily lives and attend religious services roughly every week, while nonreligious Americans say roughly the opposite. Moderately religious Americans constitute either those who attend services without feeling any real connection to religion or those who say religion is an important part of their lives but that they do not attend religious services.

The Public Religion Research Institute (PRRI) published a study in February that found that one-third of millennials who left the religion they grew up with did so due to "negative teachings" or "negative treatment" regarding the LGBT community.

LGBT issues, rather than faith, has played a major role in pushing people away from the church, PRRI found. Gallup's findings may suggest the same, as within the "moderate" category the percentage of LGBT and non-LGBT respondents meet.

Twenty-nine percent of both LGBT and non-LGBT adults qualify as moderately religious, and 11 percent of LGBT respondents and 12 percent of non-LGBT respondents attend religious services roughly once a month.

The LGBT community is split almost in half between those who say religious is important in their daily lives and those who say it is not.

In every age group, as well, the percent of moderately religious individuals is roughly the same for LGBT and non-LGBT, and the divide between the two in the highly religious category decreases slightly with age.