In the Early Church, the first Christians used to attend the Liturgy of the Word on Saturdays at the Synagogue, but on Sundays, because of the fact that Jesus had risen from the dead on a Sunday, they made it a point to gather together for the Liturgy of the Eucharist.
The first thing you need to Understand is that the Adventists loathe Catholicism and have developed a repertoire that is designed solely to attack Catholicism. Pretty much anything you tell them that conflicts with their view has a rebuttal planned and ready that they will use against you. Jehovah’s Witnesses follow basically the same program with a few variations, understandable since they both sprang forth from the same original group… The Sunday angle is usually the first step in a long well planned attack on the Faith designed solely to put doubt and questions in your mind. Unless you are pretty well grounded in theology, I wouldn’t engage in a debate with him. His attack, and believe me, it is an attack, even if he is personally unaware of it, is well planned and your responses anticipated.
Good luck trying to explain that one! I had a Adventist try to convert me not to long ago and it did not go well! She stopped talking to me when I started to question her about the Sabbath and their “prophet”, Ellen G. White. She went on the defense. For what? If your Church is the only “true” church, then why become defensive over a seemly innocent question? What I took from her, is that Adventists are anti-Catholic big time! If your friend is anything like this woman, than he will probably go on the defense if you question him about his faith.
