Well I've gone in at the deep end and I have learned a lot...
Firstly Bartle's wise comments would have been useful had I taken them onboard before the plunge, there are many on the site who not only have a 'Christian' perspective but are highly literate and knowlegable, far more so than I.
So my initial reaction was that I am wasting my time, but I carried on, took a few blows to the chin and tried to put subtle point across, mainly in the guise of questions.
One thing I learned is that they use the argument 'we've dismissed that in thread xyz123 so we're not going there again' and when you go to the thread there's a 100 post debate on something with no obvious conclusion, so really it's not a viable answer.
The other thing is one person can rant on about how Darwin was the bomb, but as soon a you open your mouth and mention Religion / God / the bible, you warned because of preaching. I have read some long posts that are 'preaching' but be cause they are from evolutionist talking about how obvious it is that there is no god, no one bats an eyelid.
I have got a few good comments in about the law and it's consequenses and recently I put one on saying how God saw me as 'deceitful and wicked' though I left the Jer 17:9 bit off.
I have also put in some genuine science questions to help my 'credit' but sometimes I think I'm on a looser from the start.
But I'm not there to improve me but to be there for any one who wants to go deeper, like Bartle said, it's in the PM's that will show the fruit.
My tree's empty at the moment.
I'll keep you informed if anything interesting happens.