Hebrews 10.24-27. St. Paul claims forsaking the assembly of believers merits eternal hellfire.
And let us consider one another, to provoke unto charity and to good works: Not forsaking our assembly, as some are accustomed: but comforting one anther, and so much the more as you see the day approaching. For if we sin wilfully after having the knowledge of the truth, there is now left no sacrifice for sins: But a certain dreadful expectation of judgment, and the rage of a fire which shall consume the adversaries.
Why is it always so easy to make doctrinaire Protestants like yourself look so foolish on these points?
1) Paul was not the writer of Hebrews. No one knows exactly who it was but most scholars believe that Paul was not the author.
2) Notice that the writer said "as some are accustomed." This shows that not all Christians met at regimented times but as they were able. To imply a command when the writer is stating a fact of occurence is disingenuous on your part and the result of poor teaching.
3) While Christians should gather for the purpose of mutual edification and encouragement, as we are one Body, there are not "firey consequences" for neglecting to do so.
The judgment that you refer to applies toward those who reject Christ after having first receive Him and not about gathering or not gathering with other believers. How you can tie that in to a judgment on those who choose not to meet is ridiculous.
Come on. Is this the best a Catholic can do?