Religious freedom is not something we should conserve?
Of course religious freedom should be conserved. But religious freedom inlcudes all relgions. When a narrow subset of one religion starts making laws based on their interpretation of whatever, then it starts to impinge on others religious freedom. The way to alleviate this is to maintain a government based on secular values which do not favor one religion over another. As a religious person, or a non-religious person, you are then free to live your life as you wish as long as you do not violate any laws.