Why do you ask "Why...the 'ifs'?" I literally just explained it.
Here:
You're dissing science because you're essentially complaining that one can always formulate more questions after a scientific conclusion, even with something as seemingly concrete as a scientific law (e.g. "Is it possible that Universal laws can change over time?"). But, in contrast, you defer to and advocate for a religious view (by the way, you invoke a false dichotomy, here -- a fallacy in its own right) by basically claiming that it gives you all the answers so that you don't need to ask any more questions.
And so, getting to the root of your problem, you completely gloss over the relationship between faith and reason, where one uses evidence to justify faithfulness. Accordingly, even with faith, you depend on reason and evidence, and by undermining an inductive process like the scientific method, you are undermining your own inductive reasoning that leads you to live with a religious world view.
Not "dissing" science at all. Simply against the stating as truth and reality certain scientific findings that are theory or less than theory. That's it in a nutshell. Included in the nutshell are the things that say Evolution is real, and the universe is billions of years old, because they include the "if"s at their base or core. If means maybe and maybe not. State it clearly and truthfully, right out in the open, rather than turning it into a religion.