Very late to this party, but I'll throw my 2 cents in anyway.
I keep my beliefs to myself 97% of the time, the other 3% comes from folks actively inquiring about my spiritual beliefs. Some don't mind my answer, some do. That's not my problem and I feel no shame or guilt. However, I do not and have not ever slighted any religion or belittled any believers. I consider that very disrespectful.
Nonetheless, I do not shy away from debates with believers as well, but I only discuss it with those who can actually carry on a measured, respectful discussion on the matter. If it gets out of control, I disengage.
In real life, I am much the same way. I keep my personal spirituality to myself and don't disparage others over what they believe. I find myself in an interesting scenario here over the past 6 months or so, because I am engaging in debate with predominantly atheists over the existence of God. From their perspective, I am some sort of "religious fundamentalist" but I repeatedly reject the claims of being religious. I am not religious.
I challenge the atheists on their arguments because they are weak and superfluous arguments. They like to attempt perverting science to promote atheism, and I call them on it. Now I could probably just as easily seek out a Christian forum and pick on Christians for their beliefs, but it's no fun for me to pick on Christians. I had much rather razz on atheists.
I am a Spiritualist. I don't simply "believe" in God, I am spiritually connected to God. It's not the God of the Bible or the Christian God, in fact, it has no humanistic attributes of Abrahamic religion or any other organized religion. It's spiritual energy, a guiding spiritual force that I know exists because I connect with it. Don't really care if anyone believes it, not trying to "win souls over" for God. It's just my personal spiritual foundation.
I have respect for most religious people, I believe they are honestly and earnestly attempting to understand a real spiritual connection. I respect what I've read and understand of the Bible and the teachings of Jesus, I think there is a lot of wisdom there for leading a good spiritual life. I don't believe it is The Word of God or Jesus is The Son of God, but it is a great inspirational book of guidance for many, and I can appreciate that.
My argument and point of contention is with atheists who reject human spirituality. Even though the evidence shows humans have been spiritually connecting for all their existence and there is no scientific evidence to disprove spiritual nature. In fact, the scientific evidence very much suggests that spiritual nature created physical nature and reality.