Let's say the consensus is that our species, we being the higher primates; homo-sapiens that is, have been on the planet for at least 100,000 years. If you're Christian, you have to believe that for 98,000 years our species have suffered and died; most of its children dying in childbirth.. having a life expectancy of about 25; dying of their teeth, famine, struggle, war, suffering, misery. For 98,000 years Heaven watches with complete indifference. And then, 2,000 years ago it concludes, "That's enough of that, it's time to intervene.." The best way to do that would be by condemning someone to a human sacrifice somewhere in the less literate parts of the middle east. Not, say, "Let's appear to the Chinese where people can read and study evidence and have a civilization, no, let's go to the desert and have another revelation." Hence, salvation is offered, redemption is promised at the low price of the surrender of your critical faculties.