Why would catholic priest get upset when people questioned the catholic chruch?

My grandmother ask me to join herto mass. I didn't want to be rude much less hurt her feelings so I went. To be honest it felt so awkward and weird after a decade not going to catholic chruch. Mind you my grandmother has hopes of me joining and coming back to catholic religion but thats not going to happen. So my grandmother told me to speak with the church leader my grandma calls priest father which is weird. The pruest got annoying because I called him Sir instead of Priest whatever. So I bought my bie with me and had a small debate with this priest individual. So this priest tells me that the catholic church is the only and truth church and all catholics are going to heaven while other none catholic people are going straight to hell. I ask the priest to show me with bible scriptures. Then I ask well if Jesus was born in Jerusalem you catholics claim Jesus established the catholic church how on earth did the vatican ended up in Italy when Jesus wasn't even born in Italy? no answer Why isn't Jerusalem the catholic capital if it was Jesus church? No answer few secounds later priest tells me well people travel from Jerusalem to Italy back them. I told the priest but people didn't even had airplanes back in the day how did they travel? Priest got so red angry and annoyed and yelled you ask way to many questions shame on you. Your going to hell. I respond I tough only God can judge me and make that decision for me. Priest got upset andntold me it's a sin to be questioning the catholic church shame on you. Wow so now it's wrong to ask questions. In my brain this men lost his marbles.

Why would catholic priest get upset when people questioned the catholic chruch?
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