As a Catholic, basically you’re required to live a Christian life, pray daily, participate in the sacraments, obey the moral law, and accept the teachings of Christ and his Church. Following are the minimum requirements for Catholics:
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Attend Mass every Sunday and holy day of obligation.
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Go to confession annually if not more often or when needed.
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Receive Holy Communion during Easter. Receiving weekly or daily is encouraged, though.
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Observe laws on fasting and abstinence: one full meal on Ash Wednesday and Good Friday; not eating meat on Fridays during Lent.
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Obey the marriage laws of the Church.
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Support the Church financially and otherwise.