User blog comment:Yxz2014/Has anyone noticed this before?/@comment-70.26.254.173-20140823140547/@comment-69.21.157.38-20140902024812

Or not only as just a weapon.

Remember (I'm pretty sure when Eren and Pixis were walking on the wall) when Eren (or Pixis) said something about Humanity coming together to fight a similar enemy.

My theory is that what if a huge war spilt humanity against each other and the fighting was endless, and someone just wanted people to unite and created titans just for that reason. Although, that's not quite how it worked out (as titans began to slaughter humanity) and they somehow figured out to create collossal titans and built the walls. Then, someone decided to create a church dedicated to this particular scientist, in which the religion morphed and they began to worship the walls. (Not too sure on what the religious folks really worship, considering how they already knew about the walls.)