A Bible believing Christian cannot attend Mass, and the teachings of the Roman Church are contrary to scripture, and heretical.
During Mass, they re-crucify Christ, this is what it is, we know Christ was sacrificed once for all time, the Godly for the un-godly, and while in the OT they needed atonement each year, Christ atoned for our sin, ONCE FOR ALL, then sat down at the right hand of the Father as high priest to those being saved.
Most Roman Church members and Protestants don't really know what the Roman Church actually believes, this is how salvation works in RCC. One is baptized, at this time they are perfect, they have attained enough "Merit", pay attention to this word, so that God would be unjust to not allow them into Heaven. Now if they sin, they kill this grace in them, so they go to a Priest (Not our High Priest), but a sinful man, they confess the sin, and if they do certain works, IE saying "Hail Mary" X amount of times, or other works, if they do this, they will gain back MERITS. Why do they pray to Mary or the Saints? They figure that Mary has so many extra merits, as do the saints, that they can do a sort of cosmic monopoly, so Mary passes off X amount of merits, St. Ignatius kicks in Y amounts of Merits, and now you .have so much Merit that God looks at you, thinks "this guy has so much MERIT, I must let him in". I'm sorry I'm sick I have to wrap up, I have one eye closed, but already we have massive heresy.
They never know if they are saved, all go to Purgatory, the great believers maybe a week or month, the average Church or Rome member could be thousands of years to somehow burn off sin (Which of course like everything else un-biblical). It's a big scam, puts man in charge, robs God of Glory. Jesus said two men went to the temple, one a Pharisee,he said "I thank you God that I am not like other men, I fast 3 times a week, I give to the poor, and I'm not like this tax collector, meanwhile a despised tax collector (Tax collectors in those days were despised because they would assess what they wanted, they'd often keep the difference, so not only working for Rome, but enriching themselves), yet this despised sinner wouldn't even raise his head to Heaven and said "God have mercy on me, a sinner", I tell you THIS TAX COLLECTOR WENT TO HIS HOME JUSTIFIED" HEAR THE WORD, JUSTIFIED=Just, right with God!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The Church of Rome offers no good news, blasphemes Christ, re-crucifies Him weekly, and believe GOD OWES THEM, it's a whore, and Protestants I have news for you, THE REFORMATION IS STILL ON, Sola Fide, Sola Scriptura, Sola Deo Gloria, don't buy this "Oh we're pretty much the same", we even have a different Jesus, our Jesus is a mighty savior who ACTUALLY ACCOMPLISHED HIS PURPOSE, "All that the Father draw WILL COME, and all who come I will NEVER CAST AWAY". How many times, in how many places, does God have to say we are saved by FAITH ALONE for us to actually believe Him?