No, they aren't. The betrayal and murder of Osiris are essentially a mythological version of a court intrigue. The betrayal and murder of Jesus is the stomping down of a troublemaking peasant. Osiris gets resurrected long enough to have sex with Isis, but still ends up trapped in the underworld, which is a poor sort of resurrection. Jesus' resurrection is permanent, and he isn't trapped in either Heaven, Earth, or any sort of underworld. As far as I can tell, the only places where it is claimed that Osiris rose on the third day are in polemics that try to claim parallels between Christianity and Paganism. Two of your point of contact, betrayal-murder and resurrection, are the kind of blurry connections that one gets if one searches through a broad swath of mythology and tries to fit some of it to a particular broad pattern. The third point of contact has yet to be established.
What is interesting is that you go so far afield to find a vague parallel in Egyptian mythology, when Judaism of the first century already had ideas of resurrection of its own that were tied to a final judgment. Gee, sound familiar?
My point in bringing up the virgin birth is that it is a claim Freke and Gandy made that doesn't stand up to close scrutiny.