Where have you seen a sign like that? Like what country, and what part of that country? If it's in America, I wouldn't interpret those sorts of signs as evidence of a religious attachment to science, but rather a reaction against the tsunami of anti-science sentiment that has taken over the Republican base and the people they vote into office. The Republican Party has spent the last 10/30/50 years (depending on which historical inflection points people focus on) courting Evangelicals (who themselves are a religious demographic almost entirely unique to the US) and feeding into all of their fears/hatreds/insecurities in order to get their votes and their money. If you've seen signs like that on American lawns, there's like a 99% chance that that phrasing is an intentional low-key troll vs. Evangelicals and their choice of words when they pick and choose what to believe in from both science and their own religion, and how they choose to defend those beliefs.
People not "believing" in science is a huge freaking problem, and is just one of many symptoms of the hellbound handbasket America finds itself in right now. Science by definition is not something you choose to have faith in or not. The only way to disagree with science is more science that disproves the previously accepted science, it's not a choice of faith or belief. The way you can tell that science doesn't function as a faith-based enterprise is the fact that one of the greatest accomplishments a scientist could have is disproving long-held scientific assumptions, which itself can only happen with reproducible results.
For example, a Pew Research poll from several years ago showed that fully 2/3 of self-identified Republican voters were Young Earth Evangelicals, meaning they believe that the planet is ~6000 years old and any evidence to the contrary is either wrong, or a literal test of faith by an apparently insecure deity who will only be satisfied by the basest, most unthinking fealty imaginable. That's obviously going to have an impact over the long term.
What does this lead to? People like Lamar Smith being made the chair of the House Science Committee. Someone who literally doesn't "believe" in science, who has used his authority for the last 6 years to literally squash scientific research that didn't lead to the predetermined conclusions that his faith (and more likely, his donors and voters) assures him are true.
TL;DR I am not at all remotely concerned about people putting signs on their lawns stating that their household believes in science. It's a couple decades too late but whatever. It's a sad world we live in where that's something that anyone feels like they need to publicly state support for.