"land of Lincoln":
Lincoln never explicitly expressed a religious belief, and certainly never joined a church nor pushed beliefs upon another (Lincoln's religious beliefs are disputed by historians. Wikipedia has a page with references to multiple books discussing them). So the "land of Lincoln", while having relevance as a motto for democracy, freedom, and equality, is a phrase that does not appear to have any religious significance.
Freedom:
Lincoln emancipated thousands upon thousands of human lives with his presidency and set a precedent for taking a stand on the belief in the value of human equality. What is Ms. Davis calling her state to do? Repress ideas, perspectives, and values of one type, while force feeding and indoctrinating values of another. I am not a Lincoln biographer... but I highly doubt this is something Lincoln could side with.
Dangerous:
What is dangerous? The spreading of information and diversified perspectives? The belief that human beings have intrinsic and inherent value? The belief that children, while being young and thus impressionable, are nevertheless valued human individuals and consequently should be presented with multiple viewpoints such that they may begin to form their own values, rather than become a mirror of ignorant ideology which suppresses views that conflict with that ideology?
I for one say that what is dangerous is exactly what she is imploring of her fellow statesmen. She is calling for the suppression of ideas and the rejection of varying perspectives. These varying ideas say nothing more than the following: we as humans can think for ourselves and determine our own values based on the diverse viewpoints we are presented with; that this life is beautiful; that each human matters in themselves; that we do not need a judge in the sky to make us moral. If these ideas are *dangerous*, then consider me a daredevil.
Philosophy:
I myself will continue to be a daredevil, spreading my ***dangerous philosophy*** which seeks nothing more than the liberation of human value and perspective. Such dangerous philosophy has germinated in the Land of Lincoln. The land of Lincoln being not just Illinois, but these United States of America which he left behind. "The land of the free..."