Very good question.
First if all we need to act upon on Islam.
When other nations or people see that how truth full, just, honest, pure, promise keeping.
Forgiving, helping, simple, faithful, trustworthy, respectable, kindhearted, caring, etc, they will be impressed and follow this religion.
This is the best way though you are young but know that how we are living, doing and behaving.
So we have to change ourselves