No, it doesnt try to debunk religion. What it does do is explains things without using the bible, plays shows off of theories, and tells of things that were forbbiden from the bible that should have been also included, things that certain religions did that they try to keep hidden, etc...
Do they do this to say "Hey look relgion is bologna and we need to believe in aliens, the big bang, and evolution", No. They do it because its part of the past, its something that gains alot of viewers, and its so easy to find things that can debunk religion that its hard to come across something that deals with Scientific law, Scientific theory, conspiracies, and history without showing religion isnt all peace and brotherhood , isnt all definitive proof of god, and doesnt have solid anything outside of faith to support it.
They call the writers of the bible story tellers because of the gospels all but 1 would be. The one lone gospel is the only written during the time the original disciples would have been alive, the rest were written after a time they would have died. That would mean the real writers were writing a story that was passed on to them because they would not have seen any of it.
There are numberous misinterpretations in the bible, even christians have trouble agreeing or disagreeing with what certain things mean.
Ancien Alien Theory, They dont make anyone believe. They present solid evidence on one side, use historical texts to help lend credence to their findings, and end up giving a more solid explanation of the events told in books like the bible and our beginnings as a species. Its up to the person wether they find it to be enough proof to believe or not.