How do you stop users from double-clicking miley_cyrus_nude.jpg.exe?
Your link is broken. I double clicked it three times and... nothing.
To answer the question, you do it the same way that Reginald Barclay is stopped from making Holodeck images of crewmates: psychotherapy, drugs, and a smattering of social pressure.
Much of our heritage still leads back to the Roman and Greek gods and earlier... even Easter!
I'll agree regarding Christmas/Saturnalia, but Easter is clearly tied on the lunar calendar to the Jewish Passover (since the Last Supper was a Passover dinner).
Why would you laugh at 0000-12-25?
For two reasons. One: year 0 doesn't exist. It goes from 1BC to 1AD, so it's either -0001/12/25 or 0001/12/25 (assuming 12/25 is correct, which for a movie is good enough). The other reason it's funny: Doc Brown wasn't thinking fourth-dimensionally. They'd need to have means of travel over to Bethlehem.
"which assault rifle would Jesus choose"
For the disciples? He would suggest the one that they could buy by selling their cloaks.
Peter would choose one with good enough aim to shoot a man's ear off at two paces.
The "underwear bomber" fails
Just don't start celebrating this with gifts pertaining to the event.
Christians on their numero uno holiday.
Easter is the numero uno holiday for Christians. Christmas is second (or third depending on who you ask).
The crap was in the LOTR appendices.
Show me anywhere in the appendices where an elf and dwarf fall in love.
Show me where the barrel-escape is a fast-paced, arrow-laden chase.
Show me the ridiculous fight between Smaug and Thorin's company. Smaug never met any of the dwarves in Thorin's group, and he never saw Bilbo. The whole time, he thought Bilbo was human (but was confused by the scent).
Show me Longshot^W Legolas using his luck powers and hollow bones to run up falling blocks.
For God's sake, stop researching for a while and begin to think!