today's God is the same God as in the OT. God is the same forever- He is outside of time. We (believer's) since Jesus are under a new covenant- not of law, but of grace through Jesus Christ. The Holy Spirit indwells all true Believer's. God the Father is in Heaven, and Jesus is sitting at His right hand waiting to call His Church (Believer's) up to meet Him in the clouds at any time (Pretribulation Rapture).
Somehow I reckon that whatever it is that happens it'll be a lot more subtle than that....and far deeper.
Greg