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The abolition of religion could be considered unethical.
Abolishing religion itself would be hard, and even tyrannical to accomplish.
However limiting state protection of religious rights to the freedom of speech, (peaceful) assembly and association would allow non-harmful religions to flourish while having the leeway to punish hate-as-religion.
Abolishing religion would be tedious.
Religion has been proven in the past to unite people and progress society.
Abolishing religion wouldn't solve any problems. We're in way too deep.
Abolishing religion would rely on removing the need for it from society. Much like a drug, it isn't useful to say that the drug should be completely removed from existence and that that will solve the problem. The root cause for the need of religion should be addressed.
Conflicts about faith-based ideas cannot be resolved by evidence and logic, and consequently religion tends to encourage authoritarian and violent means of conflict resolution.