Doddy,
Personally, I think the information should be 'sugar-coated', and most certainly should not stress the ignorance or attack the religion of the creationist (because then the creationist will think he/she is being attacked, so will put up defenses against your teaching).
Whilst I admire the sentiment, I think calling something the evidential equivalent of the tooth fairy, Santa Clause, the Boogy-Man is perfectly valid if it is so. And it is.
There is far too much pandering to ridiculous religious sensibilities.
If something is ridiculous, SAY SO! Really, you wouldn't give a seconds thought to preserving someones feelings if they still believed in Father Christmas at age 40, would you?
If someone wants to substitute wishful thinking as reality, then hoist them on the petard of reason. There is no need to apologise after the battle that you took no prisoners. It is they who should apologise, not you.
Mark
There are 10 kinds of people in this world; those that understand binary, & those that don't