You are being invited to worship God. In your worship you will find him. As you find him you will only want to worship him more. It is only as you come to know him more that you will be able to speak to those around you who are struggling with belief.
The best offering you can give is summarized by the poet Christina Rosetti in her poem In the Bleak Midwinter,
"What can I give him, poor as I am? If I were a shepherd I would bring the lamb; If I were a wise man I would do my part; yet what I can I give him - give my heart."