If you follow His commandments and love - or at least try to love all people, including your enemies. If you are asking this question, I think it means that you care. It is the people that don't ask or wonder that are in danger of not loving God. I think we all question our faith and relationship with God at times, if we are honest. Spend more time in the Word, starting with the epistles of John. That should help. Bless you!