But, let's see. You do believe he was a real person, but there is no concrete evidence that he was a real person.
Now then, you believe he was a real person because the wake that was left in his name, well, that's such an abundance and thus overwhelming, though technically circumstantial evidence, one must conclude, therefore, he was real.
I would. Because of the gargantuan wake of Jesus, his legacy, I can see no other possible conclusion that he was a real man.
Now then, as for divinity, that's an article of faith, noting that this is not the point of this thread, so I dont want to comment on that.
The point is, if you have accepted the fact that a real person who was the ultimate cause of the movement called Christianity, whether he was divine, the Son Of God, not being the argument, how come, then.....
Why will you not accept the idea that Aliens have visited, and most likely contacted many, either voluntarily though most likely ( for most) involuntarily, on earth?
Again, we're not talking religion here, we're talking popularity. And no, I'm not suggesting that aliens, being as famous as Jesus ( they come close, though ) should necessarily be believed in, it's just that, given that you will accept the existence of Jesus, without concrete evidence, just for the abundant circumstantial evidence, and that there is abundant circumstantial evidence for aliens, ( though not impacting in any spiritual way, but that is not at debate ) why would you disbelieve in their having visited the earth ?
ps. please don't bug me about the run on sentence, just read it through and it does work. 
