Language is merely a tool

Language is a powerful tool with which you can use for dakwah. If you choose to. The choice is yours. 

People can use it against you, but it is merely a tool, which means, anyone can use it and everyone can use the very same thing - it is merely a tool. 

Nobody can use it against you UNLESS YOU ALLOW THEM TO but at the same time, be careful when making assumptions lest you should read into something which is not there (Su-u zhon : having a bad or wrong assumption/judgement/perception on someone)