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Freedom, is being able to do want you want, as long as you don't interfere with someones else's rights.
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People have always tried to push their "religion" on other people, I guess it's always been that way.
And pushing the illegal morality issues gets them lots of votes, they say, "I'm a Christian vote for me", and people do.
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People have the right to be immoral, and pursue their happiness, as long as it doesn't interfere with the rights of others.
Generally speaking, what you say is true. But you are only seeing one side of it. People always have certain values, and they express these values in their beliefs and actions, and that expression always effects others.
Modern western ethics, and sometimes even our ideas of freedom, often express new values that place the self as high as possible. 'Individualism'. People can say "I'll let you do what you want, vote for me" and people do. It is a kind of humanism, because it's a belief system that centers on humans, and humanism acts as much like a religion as anything else.
The problem with this new set of beliefs is that it is not honest about itself being a set of beliefs. Humanism does not see itself as a religion but as Truth, and attempts to make itself truth through science, media, entertainment. Once it is accepted as truth, it creates laws that oppress those who disagree.
In a religiously free society, no private beliefs should be agreed with or disagreed with by the gov't. The gov't shouldn't be telling people 'that belief system is right' or 'wrong'. It shouldn't be telling Atheists 'God is real' by posting the ten commandments in courtrooms. It shouldn't be telling Christians 'homosexuality is good' by licensing gay marriage.
It is true that what consenting adults do together should be between them and God, not between them and a religious institution. But let's look at both sides to understand where beliefs are being pushed. The original reason marriage was licensed was to basically pay people to have more kids after WW2... in case there was another war, probably. That law was gov't stepping into people's personal lives and morally validating childbearing -- but people didn't complain because even if it was wrongful use of gov't, it was more money for them. Now the same law is used to validate homosexuality. By extension, this is used to strengthen a new culture where truth is whatever the individual defines, and there are no cultural norms because the individual is above all culture. That is humanism exerting itself in law. Its believers are so firm in their belief that they can't question it enough to see it as a belief. Even some Christians are swept up in this.
By all means people should be able to live their private lives with their private beliefs, but if their private beliefs require laws saying 'this belief is good, that belief is bad', they have stepped into the arena of stamping out other belief systems. They have stepped away from true religious freedom, in part because they can't empathize with whichever side they disagree with.
As for drugs that's a simpler matter -- if the drug causes enough people to lose control of themselves, it's not a personal matter, it's a public safety matter. Pot may not be a huge public safety risk, but some hard drugs are. But again, to see the balance, you have to see that the individual is not above everything. If you are blind to one set of beliefs, you won't be able to prevent it from being pushed on people; you yourself might even push it without realizing it.
Fortunately, God is bigger and God's grace and mercy abounds.