I agree with jenstar: if we are going to ban any religion, then surely it's fairer to ban the whole lot. And enforce the ban rigourously.
Assuming that'll never happen, no, we shouldn't ban Christianity. I think steve@home was trying to say that in the past Christianity was as bloodythirsty and intolerant as other religions are now. Which is true, but we have moved on rather a lot since then, and (in this country, anyway) are a very tolerant lot and if there's one religion that shouldn't be banned, it's Christianity. What would be the point and what would be achieved by a ban?