Following religious writings in spirit means taking what the writings MEAN not what they actually SAY.
For example:
The letter: If you act as a martyr, you will receive 72 virgins in heaven.
My take on the spirit: If you do not throw aside your beliefs easily and help non believers to see the light and come to understand and cherish your beliefs as their own, then you will be deemed a good person for giving someone's life direction and having the guts to stand up for what you believe is right.
Now I used that example simply because it would be the most widely recognized. I don't know for sure if that is actually written in the Qur'an, but that's what we have been lead to believe, and it also makes no difference anyway, because I don't believe in following the letter.
Let's look at Shakespeare. Anyone understand each and every single word that he wrote in his plays? Anyone with their hands up, get out. Right now. And pick up your pitchforks and suicide bombs on the way. No one knows, because none of us ever lived in his time period. What we say today, even though we use the same words as generations before us, means something often completely different. A brilliant example is the video that was recently posted showing a kids program from around about the 60's. They obviously didn't offend anyone, and we know how mothers love to be offended, but if that program were aired today I am sure that we would have coronaries all over Beverly Hills. Those poor women would be dropping like flies at the prospect of their little darlings hearing such innuendos and insinuations.
Meanings change, objectives change, languages change. I believe (and I have been called unreligious, blasphemous and a whole host of other things for believing this) that living a good life is all that it takes to be close to whoever or whatever you consider to be your God. Not hurting other people intentionally, helping those in need when you are able, protecting the weak when you can, and playing your part in bringing a new, better generation into this world.
I honestly don't believe that any sort of higher power, be it God (my vote btw
Let's open up the floor, peanut gallery feel free to throw whatever is close to hand.