A sudden intelligence explosion around 50,000 years ago after being dumb for 5 million years.
DNA that's unique to humans.
No other animals on earth have managed to send themselves into space. or are even close, and this, after all life has been on this planet for the same amount of time, yet only managed to produce one species like humans.
Every creation story involves aliens.
People are still getting abducted today and report of being probed with needles and such.
Granted there's no smoking gun (yet), but to me it makes a lot more sense and is way more possible and interesting than some invisible dude in another dimension that nobody's ever seen... and oh! here comes the collection plate!