First of all, let me start off by saying what a beautiful website! ok...
In Islamic religion (please dont bring up any terrorist remark. im new here so i dont really know the people) it is seen that the antichrist is a creature created by god to end the sinful and test it to the full. it is seen by a quote from the quaran or hadith wihcih goes something like Muhammads friend sees someone who will be reborn as the antichrist. the friend goes, we must kill him! But Muhammad goes that if we kill him that there will be no point in living. Maybe this is what lavos is, just a creature created by the entity, and the whole quest thing was just a test of faith, and crono represented humanity. or maybe it was just something the entity did and the whole quest was chance (shutup about the entity being involved) You see, the 2300 thing was humanity regaining faith and humanity. and we do not know what happens afterwards. the mutants might become the next reptites. but when lavos is destroyed, humanity just goes on with their sinful ways
or maybe lavos is an organism like a human, but just so advanced. think about. as you evolve, intelligence grows, while "morals" grow. we can see this by the number of moral rules we had back 3000yrs back. no homosexuality, no sex out of marriage, no certain foods. but know we can put self will upon ourselves. (i am not talking out of a religious view mind you) maybe lavos is the future. we become so caught up with greed and power, that we forget about things like looking good (ok, so this isnt the case now, but think about it, maybe its the opposite, some people find calories in water, which is just as bad), and sypathy for people.
or maybe lavos is just a parasite who wants to survive
another random thing i have thought of is chrono triggers belief in creation. maybe because they live so far back they dont believe in evolution , and so call the universe "the entity" the zealians seemed very advanced and i dont think they believed in god. i dunno.