If anything, those sound, at most like they are inspired by Ethical Humanism. "Surrender to Reason" is like an admission that they're NOT faith-based. Pretty much by definition, it takes the suspension of reason to maintain faith.
If I had to bet, I'd put my money on the fact that those lyrics pretty explicitly describe a pagan/agnostic set of ethics.
I always saw that as a contradiction. Reason is often associated with the Age of Enlightenment, and is emphasizing the rational world and is to some degree "anti religion". But letting angels and grace lead the way, is the exact opposite of surrendering to reason.
Well the debate over whether reason and believing in a greater power are mutually exclusive is definitely a heated one, and many have different opinions on it. And to a point it becomes semantics - some have different definition of "reason" and "faith" from others it seems. Maybe Myung meant something different by those words? Anyways not meaning to open up this debate, as this isn't the right sub-forum for it
It can be a heated one, as this debate has been going on in ethical/religious/political philosophy circles for at least 800 years now. Thomas Aquinas wrote a lot about it in the 11th Century, but even the Catholic Church's view is that faith and reason occupy somewhat separate spheres in the universe, so there's no need to fully or even partially integrate faith within the realm of reason.
Myung's lyrics are a bit confusing, I guess, because the word "grace" has a more general virtuous meaning, but it's also used in Christianity a lot. "Love" leading the way seems like pure ethical humanism to me, though. And so does "Surrender to Reason."
They could be trying to convey a religious message, but it's definitely not clear.
And in that regard, to the credit of an earlier point I made, I think when DT writes stuff like this, they really leave it to the listener to apply their own meaning to it. Is it religious? Is it ethical humanism? Well, it seems like it's almost up to you to draw that conclusion. And that's one of the things I love about Dream Theater!
Let's go to the opposite instance. Take ITNOG for example. It talks about the horrors committed in the name of God, but at the end it really asks you whether following faith
itself causes this or not. It's up to you to decide that. Well, similar with Surrender To Reason, it's up to you to interpret whether these things are religious or just simply talking about Grace, Love, and metaphorical angels from a secular point of view. My theory is that they try to touch on these topics yet let the listener decide on them purposely.
Of course that's all speculation . . . but it makes sense to my mind considering what I've heard. Anyways, whether intentional or not, DT's lyrics can be fitted to suit whatever world view you come from a lot of the time, and that's why they rock