Personally I go about religious rules in a very practical approach.
- why is this forbidden?
- do I want to follow this rule and why?
I can easily understand all the "harm none" rules. Also I'm included in the people I should not harm, cf. the "stealing food when hungry" example of Eliseahorse.
Some rules have a cultural background: it's something that some cultures choose to restrict for their own spiritual path. Some foods are forbidden in some contexts such as fasting days, because it's a spiritual practice. These practices can be IMO adapted to fit your medical needs. If you have a religion telling you to eat fish on fridays but you're allergic, get the next best thing. Is it important because of the symbolic of the fish then you need to find something with a similar symbol like fish-shaped crackers? Is it important because it's a "fasting day" then instead of cutting down the meat you can cut down something else like coffee, donuts, chocolate...?
Some rules made sense in a specific timeframe and no longer need apply. In order to know which ones, you need to dig deep into the history of religions. Some things are forbidden because culturally they were symbolically impure and it was part of a practice to be symbolically / spiritually pure. These things can be "updated" if you want to. Example: if it's forbidden to wear mixed/blended textile fibres because they are "impure" but you just cannot get any at a reasonable price, see what would the next best thing be. Second hand of 100% blends? Going for brands that are more responsible regarding human rights and the environment? Learning to make your clothes yourself so you can put less money and more labor into your clothes? A mix of all of the above depending on what's most practical for each item?
Regarding christianity, the rules of some comunities are way more restrictive than the rules Jesus said were important to follow. Double-check after me but from memory, he said the rules to follow were the 10 Commandments (be nice with others and have only YHWH / Jehovah as a god) plus "love thy neighbor". He also did not hesitate to kick ass when nasty people crossed the line and was buddy with all the marginalized people. Coz one can be a "public woman" and be sinful in that regard, if she has a kind christian heart, that's enough to redeem the few sins.
So it's up to you to decide what spiritual rules you want to follow and why. Not because somebody told you that you'll go down for it, but because you want to follow the rule because you trust the rule.
IMO (raised christian but I'm an apostate so take it with a grain of salt) Jesus is supposed to be a shepard you follow because you love him and you know he'll teach you to be kind and lead you to green pastures and peace and joy. He's not a rabid dog biting at your ankles driving you left and right with the power of fear threatening you with nasty things if you disobey.
IMO there is a difference between obeying out of trust and obeying out of fear.
So, that's how I personally managed my spiritual life. I logicked it out and mixed it with therapy. But I also know other people need other solutions. I hope that my rambling will at least give you some food for thinking your solution for yourself/ves.