Show me where the Scripture that you claim your church wrote and that if we read it, we’d know what Catholics believe, says that someone has to attend mass or it’s a mortal sin and they’re going to hell.
First of all one of the original commandments COMMANDS us to keep holy the sabbath. When Christ established the Catholic church He gave her the authority to establish rules in order to better be able to shepherd His flock. He said whatever you bind on Earth will be bound in Heaven. The church, in order to assure compliance with the commandment, determined that, when possible, attendance at Mass complied with that order from God.
When He established the Sacrament of the Eucharist, it was evident that to adequately give each of us this extraordinary gift, we would have to meet regularly. Now, if you reject His gift, then other than to hear some biblical passages and a meaningful sermon there is no need to attend Mass. Personally, because I believe in His second greatest gift to mankind (the first was salvation).I regularly attend Mass.....and I thank Him for His gift rather than try to think of reasons why He didn't really do it...