I am by background an evangelical. I'm a graduate of an Evangelical seminary -- with an M.Div. and a Ph.D. I may stand to the left of my alma mater on some issues, but the deep commitment to rooting my faith in the biblical text has not left me. Evangelicalism is not a monolithic entity, and we make a mistake when we speak of them in monolithic terms.
Martin Marty is one who has long observed Evangelicals, and knows how to read them (us -- I'm just on the left end of the group -- okay I'm now post-liberal . . .). I invite you to read Marty's comments and offer your own thoughts on the issues of climate change, immigration, and gay marriage.