I kind of really bet this matter is more because most people here are more exposed to Christianity. I mean, saying it is "the internet" doesn't change the general fact that internet issues have a lot of regional focus. I mean, American politics is talked about a *LOT* more often than the politics of other regions. Heck, you could also recognize that we have more outspoken conservative Christians on here than any other religious group, except for maybe atheism if you want to label it that.
If the other religions were more in the background, we would have more reason to talk about them, and if more people were more exposed to these religions, then we'd have more to say.
In any case, it must be recognized that this isn't just a matter of "excuse". A major issue that you propound is creationism, but the problem is that all of our major scientific authorities reject the idea, which basically means that laymen are going to find this credible. Finding evolution credible does undermine the notion of God's existence. Now, you might say "but.... but... the design arguments!!" but honestly nobody finds anything like that credible with a supposed empirical refutation.
To go even further, the entirety of the world doesn't work. Now, you can just say "this is just Adam's sin!" but the question that pops into everyone else's mind is "why did God create a world where he knew that evil, all of this evil, would happen?". They think "wouldn't a good God create the best world that he could? I can imagine a world better than this one!" Can you blame them? We've seen Holocausts, we've seen massive natural disasters, we've seen Wal-marts, we've seen religious crusades, etc.
And of course, within Christian doctrine we have a number of absurdities, such as a God who demands his son as a sacrifice(if one holds to penal substitution or similar), a God who threatens all manner of torments, and eternal suffering, etc. I mean, you can attempt to smooth away some of these issues, but certainly not all of them. I think most people would find their moral intuitions disagree, perhaps even sharply, with the religious teachings.
Finally, what is going to be the evidence? I mean, scripture is not considered infallible by most scholars on scripture, but rather it contains things that would be considered errors in any other text. And scripture is the only document that points to Christian historical claims. The problem is also that many of these historical claims are incredible and outside of what most people have experienced, and yet the only evidence is a fallible text. I think most people would rationally reject this just as they reject Hindu miracles and what not as well.