Dear Anna, Sharing your faith is not all about clever arguments, or having better answers than someone else does. Sharing your faith, at its core, is the opportunity to share a message and faith that is truly unique. Salvation is earned, given in return for our good deeds. We save ourselves by working together with Jesus Christ. In addition to what Christ does and did for us, combined with our good works, we can be saved.
Salvation is by grace through faith.
Our job in life is not to find God. Christianity alone is unique, and stands alone in the personal relationship with God that it offers.