highlighting were my eyes rested...
Joseph and Apollo are teenagers living in the 41st century who grow up worlds apart but share a common bond — both are visited by a being who calls himself God. God takes each of them on an incredible journey to fulfill their destinies. With God’s help, Apollo, heir to Earth’s grand Imperium Romanum, leads a holy crusade to conquer a perilously divided galaxy. At the same time, God helps Joseph, the deeply religious crown prince of the strategic world New Bethlehem, found a radical new religion to steer humanity away from the Apocalypse. Ultimately, the teens' destinies will collide, something neither may survive. But is God a real deity, or the imagination of two mentally ill boys?
Some of the words I've deliberately overlooked (so you can see my thought process):
living > that they're alive is implied
grow up > implied they're growing at least a little unless they both die in chapter 1 paragraph 1
common bond > implied by them being mentioned together
incredible journey > superlative / advertising speakum
deeply > I realze you meant deeply with respect to Apollo but it reads out of phase here
religion > appears a lot in this little paragraph if we shall equate God / holy / religion / crusade
(destiny appears a lot too)
I dropped Imperium Romanum for reasons I'll make a separate post about
didn't like perilously because a) adjective b) it's not that "divided" when it's 3 parties but kept for now
And then taking what you wrote and joining all the blue parts:
Jospeph and Apollo, 41st century teenagers, are visited each by a being who calls himself God. Apollo, heir to Earth's human Empire, leads a crusade against a perilously divided galaxy. Joseph, crown prince of the strategic world New Bethlehem, founds a radical religion to steer humanity from the brink of Apocalypse. Destiny calls, and each teen has help from God. Bit is this God entity real or imagination of the mentally ill?
Other notes:
a) I tried to shave off words wherever I could by joining / grouping concepts.
b) tried to get religion fown to 3 mentions (crusade / religion / Apocalypse)
c) Made God realer by asserting he's an entity (as written that last line forces him to be imaginary in the head of a believer)