Your argument seems to be something like the following (note this isn’t in a logical form, this is just for organizational purposes):
(1) Because God created us selflessly good, he would desire to make his will known to us, and wouldn’t deceive or abandon us.
(2) Therefore, God would desire to communicate with us.
(3) The only reasonable candidates for this communication are religion and/or philosophy because nothing else claims to be the word of God.
(4) The true religion must have some method of definitively proclaiming God’s word with certainty.
(5) Thus, the true religion must have some sort of structure of authority to proclaim truth.
(6) None of the following can reasonably be thought to be candidates for this communication: Hinduism, Greco-Roman paganism, Islam, Protestantism, Buddhism or Mormonism.
(7) Catholicism seems to be the only religion which meets the criteria of the religion we’d expect God to communicate through.
(8) Therefore, it’s reasonable to infer that Catholicism is God’s religion.
Point (1):
I’m down with this point. I think it disproves many of the major religions mentioned, including Catholicism though. For if God does not desire to deceive us, then the Christian God cannot be this good God; because, the Christian God does desire to deceive and has in fact deceived.
2nd Thess. 2:11-12, “For this reason God will send upon them a deluding influence so that they will believe what is false, in order that they all may be judged who did not believe the truth, but took pleasure in wickedness.”
First, I’ve not interpreted this passage, I’ve simply quoted it. Second, you’ll look in vain to the context of these verses or the Greek to mitigate their implications. Third, it explicitly says that “God will send” a deluding influence so that some will believe falsity to be judged accordingly. The most important thing is that God himself will send the delusion.
Point (2):
This seems reasonable to me. Let’s keep in mind that we have no idea what we would expect God to communicate, or how he would do so though.
Point (3):
Perhaps religious experiences are how and what God wishes to communicate. These aren’t limited to any religion or philosophy. Who knows?
Point (4):
This point is non-sequitur. You haven’t considered any philosophies or religious experiences etc. You’ve simply assumed that God would establish a religion. Further, you assume that this religion would be the entity communicating God’s word, and therefore it would have to be able to guarantee it with certainty. So, first you’ve provided no reason to think God would establish a religion, yet. Second, you’ve provided no reason to think that if he did start one, it would be the religion itself that would be proclaiming his word and therefore would have to be able to guarantee its message’s certainty. Perhaps God wouldn’t start a religion. Perhaps, if he did start one he would be communicating through it guaranteeing its certitude himself. Who knows?
Point (5):
There’s no reason to think God would start a religion, much less one which would have to be able to proclaim God’s word with certainty, and therefore no reason to think this hypothetical religion would need the authority to do so.
Point (6):
Given the criteria you’ve offered I’d say no religion meets them

I disagree with your evaluation with these religions and note that you didn’t consider Eastern Orthodoxy, or Judaism. But, this isn’t essential to the argument.
Point (7):
I find Catholic theology to be quite complicated, more so than the average Catholic could ever imagine. More importantly, I think Catholic theology is inconsistent with itself. I’ve got some interesting arguments here…
Point (8):
I don’t think this is reasonable for a
host of reasons, however, perhaps most pertinent is that you’ve offered no reason to think God would establish a religion, much less one that would need to proclaim his word with certainty and therefore authority etc.