If you're not Muslim, there's no reason for you to use it really. Even if you're trying to show respect to the Islam religion.

I guess it's not bad in the sence of saying it randomly, but if you use it in the situation of you committing acts connotated with terrorism, then it's going to be offensive because it's quite obvious you're using it as an Islamic Extremist would use it, for the wrong purposes.

If you're not Muslim, there's no reason for you to use it really. Even if you're trying to show respect to the Islam religion. I guess it's not bad in the sence of saying it randomly, but if you use it in the situation of you committing acts connotated with terrorism, then it's going to be offensive because it's quite obvious you're using it as an Islamic Extremist would use it, for the wrong purposes.