I remember back in high school, I made a personal vow of loyalty to God and the church that He built. Whenever an atheist or a doubter tells me that God is not real or say the Catholic Church is wrong, I would just laugh at them and say "When you die, you'd understand.", then leave it like that. But through time and with God's grace I realized that what I had was an immature loyalty; it was soft. How did I know it was soft? Because whenever my cross gets heavy, I'd throw it away and tell the Lord it's too heavy but I love thee. And that happened a lot; No resolution whatsoever and I was going nowhere.
I think loyalty to God must have a purpose. If it's not to know God more and to be closer to Him, then what is one's loyalty worth? To reject a teaching that contradicts the Church is not the same as to accept Christ and learn more about Him--One leads you to a dead end; The latter one moves you forward and advances you to a stronger faith. It is not enough that we reject a false teaching. We should be able to answer why it is false, and be able to show the truth. Genuine loyalty to God is loyalty with a backbone of a serious desire to know and accept Him and His bride (The Church).
When doubters pour an ocean of questions and you are able to command the waters to clear the way for the answers to pass--yes--is evidence (fruit) of true loyalty, but not being able to answer doubters doesn't necessarily mean that one is not loyal. It means we have more to learn, and we must desire to learn. That desire to learn instead of yielding, is a reflection of loyalty.
Does one have to test one's loyalty? Well, I think we don't need to test how loyal we are. Constantly we are already being tested with trials not because God needs proof of our loyalty, but rather to prove to ourselves how strong we've become.
