Thinking about it now, I'm not entirely sure I actually did feel it.
I made a point of going through the mental motions of loving God, but I don't know that there was any genuine feeling there.
Inasmuch as I did have a sense of what sort of love it was supposed to be, I would say it's analogous to a child's love for a parent.
But again, my love for my actual parents corresponds to meaningful facts about the world, the capacity of my parents to suffer, the sacrifices they made for me and my sister, the prospect of losing them. To me, love is not an emotion so much as a connection between two people and all of the needs and obligations that go with it. It's something that arises naturally in response to the relationships between real people.
I'm not sure if it's something you can choose to feel for an imaginary friend because a book says you should.
Ask a Christian the following: say God is destroyed by an usurper-God that will take His place in the heavens, but promises to maintain the same morality as the old God and to relate to you in exactly the same way. Nothing is changed in terms of the fate of your soul or how you're expected to live, but the God you "knew" as a child is personally dead.
Apart from publically paying lip service, do you honestly care?