Advice needed: My philosophical position is destroying my relationships

[Ryft]

I was quite insensitive with how I argued my point and could have done it better. It's not that I keep meeting girls who are easily offended, it's that I tend to easily offend them by my lack of tact when trying to express myself.

It is difficult, to say the least, for anyone to advise you on how to better express yourself when we have no idea how you've been expressing yourself. Given that, perhaps you could provide a couple example snippets of he-said-she-said, whereby we can evaluate (i) what you said (ii) in the context it was said, and maybe offer some advice on how you could have said it differently. (Although I am not an atheist, that does not prevent me from providing advice.)