I'm not really.... really convinced

This could be a genuine reason for not getting involved in mission ... it's often what is behind a lot of the other "reasons" for not getting involved. And you do need to be convinced that Crosslinks are doing something worthwhile before you go very far in supporting us... or going overseas yourself

Some people are not convinced that Jesus is the only way to God - and, if you're not, then there are good reasons for not spreading his gospel in areas where people will be persecuted when they respond. One thing we can point out - Jesus himself didn't hesitate to say "Follow me" to the Jews. Paul also did not hold back in telling Jews and people following other religions that they needed to turn round and follow Jesus. 

If we are trying to follow Jesus can we do less?

There are some books (apart from Acts!) that may help you or you could have fun arguing with the next Crosslinks representative you fall over.