I'm a middle-class college-educated white anglo-saxon protestant male. I never understood why this topic (denominational population percentages) matters to anyone other than "bragging rights". I grew up Southern Baptist because that's what my parents chose and I'm now a Presbyterian because that's what my wife is - and she's the boss.
The theological differences between most protestant churches are minimal at best, anyway. I like religion much more than the political church. I guess what puzzles me the most is that my friends and family are too busy leading our own modest lives to worry about stuff like this.
I'm a practicing Christian but I'll be the first to admit that the Bible in general and certain stories specifically are just as strange and confusing as Catholicism, Judaism, or Islam. They all require the same geniuine faith and suspension of rationality to believe.
And if you and I don't agree on religion (or politics or sneakers for that matter) that's okay. Our differences are what makes things interesting.
One of my favorite song lyrics sums up how I feel about ultimately not knowing what happens after death: "See you in heaven if you make the list" (Man in the Moon - REM)