Is a Protestant Baptism Valid After Converting to Catholicism

If you were baptized in a Protestant church, do you need to be re-baptized after becoming Catholic? Jimmy Akin explains Church teaching and answers more questions on the Great Apostasy, Torah observance, and whether being late to Mass is a sin.

Questions Covered: 

• 01:55 - A Jewish friend said that everything went wrong after the Apostles. Was that the Great Apostasy? How should I respond? 
• 07:21 - How is sedevacantism, the SSPX, and the Fatima Secret related to Malachi Martin? 
• 14:22 - I heard once that the unforgivable sin is becoming an atheist. What is the Catholic stance on this? 
• 20:42 – What is the relationship between the Knights of Columbus and the Catholic Church? Is it okay to celebrate deceased parents and loved ones and say they are together in heaven? 
• 28:50 - If I was baptized in a Protestant church and then converted to Catholicism, is my baptism valid? 
• 31:19 - How do I reach my brother who has recently converted to Torah observance? 
• 38:23 - My LDS friends would say “know them by their fruits” as a reason to convert to Mormonism; how do I respond to that? 
• 46:45 - Is it a sin to be late to Mass? 
• 49:58 - How do I respond to the claim “Jesus’ crucifixion paid all debts, including temporal ones”?