You may find the pace of Latina Christiana a little slow; not so much in terms of the memorization, but in terms of presentation of grammar.
You won’t be reading/composing complete (i.e. having a direct object) sentences until volume II.
If you do find this to be the case, I’d recommend find a copy of Jenney’s Latin I published by Allyn & Bacon (out of print, but available online.)
It’s not a “Church Latin” text per se, but basic grammar is the same for “Church” Latin as for “Classical Latin” (until you want to try translating Augustine.) ( And you can still use ecclesiastical pronunciation with any grammar.)
Jenney’s text is extremely methodical and user-friendly* and it gives you the same basic vocab as Latina Christiana, but presents grammar at a more satisfying pace for an older learner. (It moves a bit slower than Henle.)
The Latin Road To English Grammar is another text I’d recommend if you get frustrated with Latin Christiana’s pace.
[size=2]Incidentally, I also find Collin’s Primer rather unusable (except perhaps with college students already familiar with Latin.)
[/size]*Now, I happen to think the 1933 version of the Allyn & Bacon textbook (without the Jenney revisions) is the best Latin textbook ever, hands down. But it’s a lot harder to find and I was greedily planning on acquiring every available copy (when I win the lottery) myself.]