The Hitler one is very misleading/deceptive at best.
The passage in question is
Quote
23 Then he went up from there to Bethel; and as he was going up the road, some youths came from the city and mocked him, and said to him, “Go up, you baldhead! Go up, you baldhead!”
24 So he turned around and looked at them, and pronounced a curse on them in the name of the Lord. And two female bears came out of the woods and mauled forty-two of the youths.
1) They weren't necessarily kids. The original (untranslated) word for "youth" has been used to describe people other places in the bible known to be up to 38 years old. And considering they were allowed out of the city by themselves, it's probable they were at least teenagers.
2) They weren't killed for calling him bald. To put the passage in context, Elisha was Elijah's disciple, and Elijah had recently "ascended into heaven in a whirlwind" (earlier in the same chapter). Shaving the head bald was a traditional sign of mourning. When the youths say "go up, you baldhead", they're calling him a liar, and mocking the supposed miracle of Elijah's ascension into heaven (like, "if your master really did ascend to heaven then lets see it, ascend now, go on"). So they were killed for blasphemy, not for calling someone bald.
If Christianity is really as absurd as you seem to think it is, you shouldn't have any problem finding ways to ridicule it without making stuff up. If you have to resort to basing your criticisms on fabrications like this though, then you're just as ignorant/foolish as you accuse them of being.