Everything else follows from that, at least in Christianity.
I suppose I believe in "other planes of existence" (is this supposed to be Heaven and Hell or something?), but those are contingent upon the truth of Jesus' suffering, death and resurrection. I guess I'd say I think we already exist in another "plane" which is immaterial and inaccessible in this life, but is nonetheless real.
I suppose I also "believe in a deity," but not with the connotations you seem to be suggesting. God is not some component of existence or reality or the universe, independent of other things; He is the only source of what it means to exist. I would say I don't even believe that God exists, but that He is below or outside of existence, as He caused everything else to exist that exists. If someone believes in God as a sort of Santa Claus or Jinn granting wishes, then no, I don't believe in that kind of "deity" either. That's just silly nonsense.