I have a handful of STEM degrees.
My experience was that there are more believers around than you think, but most of them are quiet because of a few very loud atheists who carry a lot of weight, and the majority of believers simply aren't well grounded enough in knowledge and in the faith to competently argue.
also among microbiologists there are almost zero atheists. the more one studies life itself the more apparently ridiculous evolution becomes outside of divine intervention and purposeful design and control.
The constant refrain from pulpits is that universities are 100% out to turn believers into nonbelievers but that was not what I saw at all. I was there for 13 years or so. what I saw was weak Christians who couldn't stand up to easy challenges, timid people who just avoided confrontation, and overall an honest seeking after knowledge that woefully needed intelligent, grounded Christians to speak up in. there is nothing to fear. our faith is not an idiot faith, but a thinking man's belief. do your homework. bring their arguments to places like this. there are answers.
I've spent over 35 years in the academy as a student and teacher, and I've come across many Christians who are not afraid of sharing their beliefs and addressing challenges as needed, too.
Yes, higher education is highly secularized like many institutions in our society, but I was blessed to explore my faith in more depth at a secular university by combining my love for English literature with the Bible and great Christian writers such as Alfred Tennyson, T.S. Eliot, and Russel Kirk.
One key for me when topics came up related to faith and my Christian beliefs was to be respectful towards those who hold different beliefs like Islam and even agnostics and atheists. I never directly quoted the Bible, which puts up defenses immediately. Instead, I would paraphrase teachings from the Bible in common language and expressions. Most of the time, I saw heads nodding and very rarely did anyone challenge my observations when I took a strong, well-argued Christian position.
Some of my best professors at this secular university were Christians as well and weren't afraid to say so in class. They helped to strengthen my faith and become better educated in Biblically grounded, fact-based Christian doctrine. It's hard to argue with the truth, God's Word.