> In the Christian view, sex is a sin.
Good post except for the above part. In the Christian view, if biblically followed, sex is not a sin. Fornication, adultery, prostitution, incest, ****, etc., are indeed a sin. But sex it self isn't. It is stated that if you burn (in desires) take on a mate, get married. That way you can have sex, safe sex, secure sex, blessed sex, which also is more likely to be responsible sex -- that is, if children are conceived, the mates more likely will hang around to raise them. The bible also advises for husband and wife to give and receive pleasure from each other, sexually.
Though it depends upon which interpretation, which sect has twisted it out of context, which have taken a good thing and think they can make it "gooder" by pushing it so far over the line that no mortal could possibly follow the rules, imo.
In addition to the examples you listed and then I listed, I tend to think some other reasons why religions have gotten out of hand are because when the original concepts and precepts didn't seem to help (example, during times of crises or catatrosphes) the people and or their leaders blamed themselves and dove even deeper and harder and more impossibly into those concepts and precepts in hopes it would appease their god (such as many of the superstitions that arose); or good-hearted (who became corrupt) and or the not so good-hearted (who already were corrupt) came into power in the group and twisted things around to benefit them rather than the rest of the group; or people branched away from the main congregation when rules didn't work for them, so they twisted or outright fabricated their own set of (religious) rules. I would guess, however, the biggest reason was people simply misunderstood what was written, what prophets said, and what Jesus said -- and then centuries muddled them further.
However the general principles which Jesus taught remain the same, and are generally very simple, such as; it makes sense to take care of your health and body because no one else will and because if you don't you will suffer and die a lot sooner than you should; it makes sense to do things that make others healthy because we cannot live alone in this world, it requires many peoples, many skills, much help -- and because if you wound someone, likely they or their family/friends are going to want to wound you right back; lying, cheating, stealing don't pay off because sooner or later someone is going to discover it and you'll be in big trouble here on earth with the man-made laws, as well as with God later on; benevolence, love, joy, laughter, hope, peace all feel better than do malevolence, hate, depression, dejected tears, despair, stress and tension and fear -- that is, if you're sane -- if you're insane (whatever degree) you more likely may think it's the reverse. To me it just makes more sense, requires sanity, to want to be healthy and happy up to your final moment; whereas makes less sense and is born of insanity to want to harm your body/mind and become sick and suffer up to your last moment. Punishing yourself doesn't help anyone. The only good it does is at the beginning where it raises your conscience (hopefully); afterwards, learning from your mistakes, righting them with yourself and others, and thereafter living/behaving more sanely and heathily is the best way to go about it.
Well, anyway, not to imply I'm perfect either. I've learned, still learning. Just my two cents again, the likes of which may come across so obvious that it's ridiculous, and yet, you'd be amazed how many people overlook the obvious until someone actually makes them look at it. Common sense is a cool thing. Coupled with listening to one's inner wisdom and instincts, while looking back at any hindsight as points of references what to repeat or not repeat....