Lol @ "profit Mohammed" - and YY to your point, Techno.
By comparison: if someone wants to tell me my feminism is a foolish or damaging thing, my choices are to dispute their ideology or ignore the attack. I may feel personally attacked, as may they. It's our responsibility, though, to consider why an ethical/philosophical statement feels personal and to separate our egos from the principles. Religious people have the same responsibility, imo.
It's a bit tough because religions don't stand up to logical examination. In the end you're always going to be disputing "faith", which is an emotional choice. This can be discussed, though, from a variety of angles. I love such discussions, but it's no good shouting JESUS DIED BECAUSE HE LOVES US! It's clear I disagree with that. It's annoying when believers insist this is a fact, and won't go beyond it to look at what this faith does for them.
Where your believer in the street's concerned, I can't help thinking they feel threatened by secularism because their beliefs don't stand up to logical examination. With religious organisations - those who direct the believers - it seems more likely to be about power and control.
I'd like to think secularism was a sort of all-loving, equal rights movement, Techno, but I'm afraid I don't! It's not a 'movement', really, is it? It's just an absence of something. I haven't got a car, but all that tells you about me is that my life differs in various ways from a driver's. You can't draw any conclusions about me from the absence of a car.