One problem is that almost every religion holds that we are born in some sort of default 'original' sin and must spend our entire lives trying to make up for something we never did and is impossible to make up for, and that is apparently inherent in us. I have a real issue with that. The whole claiming we have a inborn debt to something? That just seems ludicrous.
Not really. In fact, I think the concept of original sin is limited to Christianity. At least it's the only one I can think of.
EDIT:
Climate change. You'd be hard-pressed to find people on this forum who don't believe in at least some anthropogenic climate change. Exactly how much, and what the effects will be, is still debate-worthy...but science boards frown OH SO VERY HEAVILY on anyone who dares to question, and can try to ruin peoples' careers over it. Okay they don't burn people at the stake, but neither does religion anymore. Me, I lean on the side of "oh shit this is serious", just for the record, I'm no denier. But I gotta point out the similarities between that and what religion is accused of. Not that different.
Even though the scientific consensus is VERY aggressive against new concepts, you've picked a terrible example. It took decades for the science behind Anthropogenic Climate Change to prove itself adequately and once it did it
became accepted because no solid criticisms were left. There have been a few efforts by people who could actually be called "Climate Skeptics" to show alternative reasons for recent warming, but while they may have added some new information they couldn't explain the situation differently. Most of the efforts against AGW stem from an utterly non-scientific movement that can only be described as "Denialism" and this movement isn't excluded for being different, it's denied because it attempts to add nothing, attacks the character of people to reduce their legitimacy, and engages in outright distortion of facts to push itself into the public sphere.
Neither do you seem to understand the difference between holding a stance because of evidence and the holding a stance because of tradition. It is a virtue in the realm of science because eliminating bad information is the basis of the scientific method (and "good" information is only that which has so far survived criticisms). In religion there is nothing to make one claim more or less true than another, except in cases where scriptural literalism reigns, and even then those claims are only "true" within the circle that believes in scriptural literalism and the scripture isn't ambiguous or contradicted by other scripture. Using faith one cannot say any particular belief is more or less valid - whereas reality has the annoying habit of occurring whether you believe in it or not. Reality is also something that can be checked rigorously.