Freedom of religion means the freedom for adherents of a religion to practise said religion within the limits of the law.
I'm not sure that the 'within the limits of the law' bit is quite true. For instance, under a previous Nepalese Constitution (and poosibly under the new one),people were not allowed to change religion from that of their father. Over a period of time (in the 60s and 70s) a large number of Christians were arrested under the terms of this law. Initially, they were simply arrested and exied to another part of the country - with minimal involvement of the courts. In the mid-70s, 3 generations of men from a leading Christian family were arrested and properly charged, meaning that they, at least, would see the inside of a courtroom. When faced with the charges, the grandfather - whose father had been a Buddhist - pleaded guilty, only to be told that (as his father hadn't been a Hindu) nothing would be done. His son and grandsons, however, pleaded innocent, on the grounds that they were following the religion of their father. It came to light, at this stage, that they had been beaten by the police in an attempt to get them to renounce Christianity and 'returm' to Hinduism. They had refused on the grounds that 1) their ancestors hadn't been Hindus so they couldn't 'return' to it and 2) that if they did become hindus, they would actually be breaking the very law that they had been arrested and charged under!! Few, if any, laws are worded in ways that actually result in what they had been designed for; even court decisions that create precedent can change the lawmakers' original intentions.
Freedom from religion means that those who are not adherents of said religion are not expected to observe, abide by or be inconvenienced by the rules of a club of which they're not members.
The corollary of this is that religious people are equally "not expected to observe, abide by or be inconvenienced by the rules of a club of which they're not members" - so legislation that runs counter to their beliefs isn't necessarily binding on them. The majority of religious people choose to adhere to the majority of secular laws because those laws reflect their religious beliefs; however, there are some such laws that don't reflect their beliefs, so they oppose them, disobeying them in the last resort.