Do you mean that if I happened to reject Catholicism [not that I will], I will go to hell?
Let me try to explain this in a little more clear way.

Let’s just assume for the moment that Catholcism is true. Obviously, not everyone believes that and from the title of the thread it seems you are not sure, but let’s assume for what I am going to say that Catholicism is the true, only Church of Jesus Christ.
Now, let’s say that you
know that. Let’s say that you are 1000% sure of it because Jesus Himself appeared to you and told you and there was no question. If you rejected it then, you’d go to Hell, because you would be rejecting Jesus’ Church really, truly knowing it was His Church. You would basically be telling Jesus that you don’t care what He wants, because you know He made this Church for you to be in and you rejected it anyways. It would be total disobedience, and a rejection of salvation because you’d be rejecting the Church you
know Jesus created for salvation.
Ok, now let’s assume you are 1000% sure that the Methodist Church is true, the true Church of Jesus. For whatever reason, you really, truly, deeply believe, and I mean truly, you’re not just being disohnest with yourself here, that the Methodist Church is true. Now, we know that in our scenario here, the Methodists have it wrong and it is Catholicism. Still, Jesus does not hold it agaisnt you that you really, truly made a mistake. He doesn’t hold it against you that you got the wrong info, or whatever else happened. he realizes that you joined the Methodist Church out of love for Him, out of believing it was His Church He made for you and you joined it to be with Him, so you have chosen Him, chosen God, even though you happened to get the Church wrong.
What makes the difference in all cases is if you had any fault for getting it wrong. Did you get it wrong because, even though you had questions, you never made the effort to investigate? (This doesn’t seem to apply to you, since you
are investigating

!) Did you get it wrong because you started to investigate, but you didn’t like the answers you were getting so you stopped? Did you get lazy before you had the answer you thought was best? Did you refuse to listen to someone who offered you information? Did you not ask questions because you thought the answers would be difficult to handle?
In other words, did you do anything deliberately that made it your fault that you got it wrong, or did you sincerely try to figure out where God wanted you and just happened to get it wrong? If its the former, then you don’t go to Heaven, because you didn’t love God. Someone who loved God would not deliberately do something that prevented them from finding the truth about Him, they would rather be happy to try to find out more about Him. So, if you deliberately did something to keep you from finding the truth, you would go to Hell not so much for being in the wrong place, but for having rejected God. If you on the other hand sincerely tried hard, and to the best of your ability got it wrong, then God will certainly not damn you, because you chose Him even if you “hit the wrong button.”