I believe in heaven and hell, but think they're not antithetical because (surprise surprise) they're mistranslated. There is no mention of "going to heaven when you die" in scripture. None of it. There's mention of the kingdom of heaven, and of heaven in general, but that's all a mistranslation which omits a single derivational morpheme "s". It's not "heaven" but "heavens" plural, which refers not to "after you die" but instead what we basically consider empty space, which is actually the domain (or even body) of God.
Hell is also very rarely mentioned as we've mythologized it. You have Sheol in the OT, not at all the place we think of as flames and such, which is the Hebrew equivalent to the Greek Hades in the NT, and also the very precious and fascinating Gehenna, which Jesus pretty much exclusively referred to, and is interesting because Gehenna (not "hell") is a literal physical place, an everburning trash heap southwest of Jerusalem, which Jesus in his brilliance used to compare to the life that is lived without God.
The real Biblical picture is that we need bodies to be selves. Okay then, so how are we when we die? Not sure about the transitional period between death and resurrection (maybe we're united again with God for a bit), but we need a physical resurrection so we can have physical bodies. So what houses these physical bodies? A new regenerated (and probably much huger) earth.