Just goes to show how much confusion transcription errors in the Bible have caused. Some of these scriptures were written years, or decades, after the events took place and memory errors are certain. This is the major reason Jesus' teachings are not as clear as broad daylight.
On top of that, the monks that copied and re-copied the Bible made stupid mistakes as well as alterations because their masters ordered them to tamper with the Bible. All of which makes the authenticity of the whole Bible sound like a farce--anyone that claims the Bible is infallible and was protected by Unholy Spirit ought to read it for this kind of confusion.
I see no reason to not celebrate Easter, whether or not it is in the Bible. Religious people can observe Christ's resurrection and the presentation of the value of his death as a sacrifice (notably, his death itself was not what cancelled sin, but his resurrection and presentation of the value of that death). People that do not believe in Original Sin (or even in God or Jesus) can still observe the day as an attempt to set mankind free from Jehovah and the Mosaic Law. You can even celebrate it as a fun holiday, where you have Easter egg hunts and a time to visit relatives and friends to enjoy it.
I have been seeing a trend toward gift-giving around Easter, too--though not as pronounced as Christmas. Children usually like getting fun items that are appropriate for them (but do not worry about those one-in-a-zillion risks that seem to be killing childhood these days). Get them stuff that they will have fun with, but bear in mind the economy and do not buy beyond your means.
About the only thing I do not recommend is wasting the time and energy going to the REJECT Jesus Party at the Kingdumb Hell. If you want to reject Jesus, you can do that without wasting the time. If you want to honor him, you can do it at home or at a regular church of your choosing.