Before we get to the snakes, what do we mean by religious freedom? I think it means that individuals can practice, promote, and proselytize for their religion, but that government cannot favor one religion over another, or religion over non-religion. If government exempts an action from law because of a person's religious belief, I think that same exemption should apply to non-religious conscientious belief. Example? The Supreme Court ruling in favor of an atheist conscientious objector to war.
However, claims of religious belief or conscience cannot be used as a valid excuse to undermine society's promotion of the general welfare. For instance, we must pay taxes even for government expenses we morally oppose. For me that would include wars in Iraq, Afghanistan, and the War on Drugs; for others it might include Obamacare. A pharmacist should be required to dispense prescriptions regardless of religious belief, just as a supermarket cashier is required to check out meat products regardless of vegan belief.
An unconscionable bill passed by the Arizona Legislature would allow widespread discrimination against the LGBT community in the name of religious liberty. If the governor signs it into law, business owners can refuse to serve gay customers by claiming that it would violate their religious principles. A similar measure was recently defeated in Kansas, but such bills are being considered in other states.