1. Yep.
2. A theory is not a belief and should not be a belief. It is an attempt at explaining and describing a phenomenon and a framework for making predictions. Beliefs have nothing to do with theories. Accepting that a theory is the best explanation at the time of the current available evidence is the most anyone should do.
That was sloppy of me. Allow me to correct the mistake:
A scientific theory is a series of statements about the causal elements for observed phenomena. A critical component of a scientific theory is that it provides explanations and predictions that can be tested.
Usually, theories (in the scientific sense) are large bodies of work that are a composite of the products of many contributors over time and are substantiated by vast bodies of converging evidence. They unify and synchronize the scientific community's view and approach to a particular scientific field. For example, biology has the theory of evolution and cell theory, geology has plate tectonic theory and cosmology has the Big Bang. The development of theories is a key element of the scientific method as they are used to make predictions about the world; if these predictions fail, the theory is revised. Theories are the main goal in science and no explanation can achieve a higher "rank" (contrary to the belief that "theories" become "laws" over time).
I agree. Scientific theories are complex things, not just in how they come to be scientific theories but also in how people associate with them cognitively. Most people, in my experience, don't seem to fully grasp scientific theories which is understandable given their complexity, and on top of that most people think that theories are either facts, beliefs, or in the other extreme: baseless speculation (as some in this thread do).
There seems to be, IMO, for human beings some psychological need to have certainty. Even some non-religious people think science is about Truth when really it's about truth. And the hard to grasp part of that is that for science there is no real certainty. All of it is open to doubt. And that is a feature of science and not a deficit. Based on current evidence I
feel pretty certain that the current theories about evolution are for the most accurate (notice I didn't use the words true, or correct, etc.) but they could be completely off-base in a way that I can't imagine or foresee. That doubt is anathema to dogma and allows for learning, growth, and a continued seeking for truth. I think it would be defined as skepticism.
Many of the posters on this thread know very little regarding the theories about evolution, or cosmological theories and wouldn't take the time or make the effort to even read about them. Nor do they understand of what or for what these theories comprise, demonstrating that when they conflate common descent with the beginning of life on Earth or the Big Bang with the beginning of the Universe. Or when they think evolution is a fact and a theory. Even some atheists make that mistake.
I don't post often on these forums, but when I do, it's when people misunderstand, mischaracterize, misconstrue, or are not familiar with science. Atheists and the religious alike.