I don't think the Church ever formally condemned LeMeitre or his theory. So I don't see a problem with accepting it, personally.
The Church has never "formally condemned" every, single error in history. There's simply not time to do so (nor is there a reason). Catholics aren't allowed to believe in something simply because "I've never been told I can't". This it's-not-condemned-therefore-it's-allowed idea is itself a heresy.
95% of the errors out there today (and there are millions of them) are already condemned, most of them indirectly.
If an error contradicts a dogma of the Faith, it is 'ipso facto' condemned. Because the dogma is truth and anything which contradicts the dogma is indirectly condemned.
Which is why it's so important for Catholics to KNOW THEIR FAITH. The more you know, the more you will recognize errors. If you fail in your duty (and it is a duty) to know your faith, then any errors you fall for are YOUR FAULT, by reason of indifference, laziness, etc.
Popes (and the Church Fathers, and saints) have repeatedly taught that Scripture is to be understood LITERALLY, unless the Church expressly tells us otherwise. Ergo, probably 75% of the Bible is to be read LITERALLY.
Genesis is to be ready LITERALLY, especially in regards to God's creation. The only area where the church has allowed "figurative" language is in the understanding of a "day", wherein saints have said it *might not* be 24 hours but a longer period (i.e. weeks). However....they have all said that to extend this day into "years" is contrary to Scripture's meaning and is an error.
Thus, the Big Bang is erroneous.