Importances of Religions

Are Religions important?
1. No, because we can live without any religion.
2. No, because we can be the good men without any religion.
3. No, because we can be happy without any religion.
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Are these answers reasonable?
Of course, No, because
1. If it is considered to only living, what is the difference betweeen we(human) and animal?
2. Who can guarantee that we are good or bad, based on which standard?
3. Everyone can be happy but is it real and eternal?