Well, that's an awfully broad brush.  I certainly don't like their voting patterns, but I'd hardly presume that even a majority of them "got their faith not by love or reason but by fear and believing what they wanted to believe".  And actually, this is too important a question to settle with such a simplistic statement.  How evangelicals come to their belief system is a very complex and important question, which has tremendous implications beyond politics.  It deserves really serious data, which, unfortunately, seems to be sorely lacking.