Amaris Cole, from the Evangelical Alliance, told Premier's News Hour: "81% of Evangelicals agree that greed is one of the greatest sins of our time, 96 percent agree that we've got a responsibility to look after our planet and to use what we have wisely."
She was speaking as the findings were released in the Evangelical Alliance's idea magazine following a survey of nearly 1,500 evangelicals.
It found even more evangelicals find teaching in the Bible that encourages them to be content with what they have, with nine out of ten saying it teaches them not to desire more possessions.
Amaris Cole continued: "We need to think about the way that we're using our money, and do that wisely.
"It's not about praying over each pair of jeans that we buy for example, but it's just about thinking that all that we have, all that we've got, is God's and we can use it for that."
They also look to the role of God in creation as a reason to care for the world around them, with 96% of evangelicals saying they have a God-given responsibility to take better care of the environment.
Dr David Landrum, director of advocacy at the Evangelical Alliance, commented on the findings: "Consumerism is the celebration of getting and experiencing what we want, and our instinct is to have it now.
"There's nothing wrong with enjoying the benefits of God's creation but evangelicals clearly think that it is not okay for our consuming to degrade our resources and natural environment.
"The Bible tells us that we are all made in God's image, and that means humanity must be treated with great dignity. Our consuming can never come at the cost of exploiting people, and we have obligations to future generations. Christianity helps us to identify the limits of consumerism."
Listen to Premier's Hannah Tooley speaking to Amaris Cole on the News Hour: