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Not really. It's like you don't have to be religious to do Pancake day. It's more of a tradition than a rule.
Lent is a solemn religious observance in the Christian liturgical calendar that begins on Ash Wednesday and ends approximately six weeks later, before Easter Sunday. Wikipedia
I have often given up something for Lent in past years and I'm not in the slightest bit religious.
It was fun when giving something up but last year and this year has been more focused on illnesses within the family so I completely forgot about it. Maybe next year?