A non-serving Christian is a contradiction in terms.
Christianity is not a religion or a philosophy, but a relationship and a lifestyle. The core of that lifestyle is thinking of others, as Jesus did, instead of ourselves.
Now God has never shouted out to me. I've never heard God speak audibly. He doesn't have to.
We receive from God, then we give to others.
Familiarity breeds complacency.
There's much you can't change, but there's something important you can change: you.