I’ve used some Alpha Omega. I’ve not seen anything blatantly anti-Catholic. They do have Protestant Christianity built into every lesson. For example, they’ll have a bible verse to memorize or they’ll have a story about a Protestant missionary with every lesson. You can skip most of these pretty easily if you find any not as complete/accurate as you’d like.
I’ve found that Alpha Omega is pretty quick to the point. They say what they want to say in as few words as possible. Which I like. Some textbooks go on and on even when making a very simple point.
I’ve not used any of their computer programs except the early writing and phonics ones. But they were leaders in the field, with wonderful Bible computer games, so I would expect their computerized courses to be pretty good. Could be wrong. Some of my protestant friends have used it. Not heard any raving, but they appear to be satisfied.
I live in a state that has very little hs regulation, so we all tend to put together our own curriculums that best suit our children. So that’s why not many of my friends use set curriculums.
Might I suggest that for second grade that you focus almost totally on reading and math. If that child learns to read well, and starts reading a lot, all the other future subjects will be a breeze. You can kill yourself trying to teach something one year, that would have taken only a few moments to learn if you wait till the child is able to learn it. There should be some challenges, but not every subject needs to be pushed to the challenge level. Learning is fun and natural if it is not made into a monster.
May God bless you in your search.