As Christians in the workforce, we're all searching to find the right balance between speaking and showing our faith to our coworkers. Living out your faith in the workplace doesn't have to mean 24/7 proselytizing in the break room, but you shouldn't exactly be blending into the crowd either. There should be "something different" about the way you conduct yourself, how you respond to your clients and coworkers, and even the moral standards you keep.
Your coworkers are paying attention, whether you're aware of it or not. They will notice what types of decisions you make, they will come to form their own opinions about you, and, over time, they'll decide if you are reliable and if they can look to you for leadership. Your actions and words at work may also help your coworkers decide what it looks like to be a Christian.
It's not about the big decisions so much as it is the small consistent decisions that will make or break your reputation. Character and perception are built and earned over a series of encounters. Making an honorable choice weekly, daily, and even hourly will help your coworkers notice that "something different" about you.
Just because the business culture around you deems something to be acceptable doesn't make it the right thing to do. That sort of statement seems obvious when you're away from the pressure of the moment, but when the heat is on and you're forced to make a snap decision, doing the "right thing" or the "better thing" that goes against the corporate culture won't always be your first instinct. So it's important that you think through those decisions, especially the high-pressure ones.