Of course we’re flawed. All fall short of the glory of God. That’s why we need Christ. Sheesh, if we were all Christ-like already, He wouldn’t have had to bother.
This article really doesn’t discuss the methodology and statistical analysis of the study, so it’s hard to make a judgement about it. But it’s widely understood that questionnaire-based research is, to say the least, afflicted with a primary confound. Which is to say, it’s not hugely valid.
The basic perspective of the secular researchers is revealed by two of the questions identified as Pharisaical: “I believe we should stand against those who are opposed to Christian values” and “People who follow God’s rules are better than those who do not.” Call me a Pharisee, then, but like most on this forum I do believe we should stand against those who are opposed to Christian values.
And if following God’s rules does not make one a better person, then God is not good, which is a logical impossibility. Christians are certainly flawed sinful human beings, but think how much worse we’d be if we weren’t trying to be better.