Does the Bible say that Christians should be celebrating Halloween?

Halloween is shortened from All Hallows' Evening which has its origins in the ancient Celtic festival of Samhain a celebration of the end of the harvest. But it was a day on which many northern European Pagan traditions or religious festivals were celebrated!!

Two Popes Gregory III and Gregory IV moved the old All Saints' Day from May 13 itself the date of a pagan holiday to try to hijack the pagan festival.

Why would God's Word teach Christians to celebrate Satan's holiday ???

The Bible does not mention Halloween. However, both the ancient origins of Halloween and its modern customs show it to be a celebration based on false beliefs about the dead and invisible spirits, or demons.

While some view Halloween as harmless fun, the Bible indicates that the practices associated with it are not. At 1 Cor 10:20, 21, the Bible says: “I do not want you to be participants with demons. You cannot drink the cup of the Lord and the cup of demons too.”​

The Bible, on the other hand, does not permit merging false religious practices with the worship of God.​ 2 Cor 6:​17

So yes it is true True Christians are not supposed to celebrate halloween.

A harvest festival that celebrates and honors those who have died. A remembrance feast given. As such festivals were dirt common, for good reason, why not. You can Christian it up. We humans shape holidays as we need them to be. Take bits from here and there we like, discard the ones we don't, etc, etc. Celebrating a good harvest and how much we miss grandma, whoop whoop. You can add whatever Christian-esque touches you wish, dollbaby. Or skip it altogether. Spend the entire day shopping for a new kitten that showed up, whatever. Up to you. That's the entire beauty of Halloween and all other such holidays-- it's up to you to take part or not. And up to you how you wish to take part or not. Ain't that a grand notion?? Wheee!

It says be superstitious only about Jesus 

You understand that in Christian DOGMA it's all hallows eve, with tomorrow being all hallows day - or in more common parlance All Saints Day!

Something tells me this is a rhetorical question, and that you've already decided whether celebrating Hallowe'en is good or bad.

No.  At the time the Bible was cobbled together, Halloween didn't exist as a holiday.

Neither Christians nor Halloween existed when the Bible was written so no, the Bible doesn't say that.

No. The Bible doesn't say anything about the 4th of July either.