When arguments for the existence of God are made, we are making inferences from the best observations gathered by science and from the principles of elementary logic to substantiate our beliefs. In the end, all of our collected evidences point to the existence of a external, much greater reality. These logical proofs for the existence of God point beyond the scope of the natural world.
The validity of each logical premise in these arguments is based on the validity of each scientific or logical fact. For instance, the universe does indeed have a fine tuning and a first cause. These theistic arguments do not simply appeal to God as a means to provide an explanation, but are logical deductions that are unpacked to get an intended point across.
If the premises of such arguments are true, then their conclusions automatically follow. This is true, regardless of how people feel or react to the validity of the presented deductive arguments.
A true scientist must be willing to admit to the possibility of many things, for they are supposed to be dedicated to seeking answers. Scientists are supposed to be about evidence. Those who reject the existence of God are indeed very biased. Science is about the study of the natural world, not searching for naturalistic explanations that rule out the supernatural.
The fact that science has discovered answers to a number of complicated questions does not mean that it can or will uncover all or even most of the difficult questions of life.