Things have meaning because they have meaning. You did not "choose" to give meaning to anything evolution invented meaning and it is built in to all the organisms of the biosphere. This absolutist relativism is un-founded. Do you think that I and the other organisms on this planet are a figment of your imagination? The existence of other entities is implicit in all language including animal language. The meaning of life is to live. Faith usually means believing in things for which there is no evidence. I'm not an atheist I just don't believe in God, Father Christmas, the tooth fairy and lots of other evidence-less propositions. If you mean by faith the drive to get up in the morning and enjoy living in social interaction with other people and learning, then I have faith just like the faith of Tigers and Gazelles.