Wow.
First, just because some is called a temple doesn’t mean it’s for religion and no training. Real life example, Shaolin Temples. They arnt called Shaolin Academies or Shaolin school.
Jedi are similar to Shaolin monks, they learn about the force like a religion but they also train in its use.
Tapping into the force is not mastery, just like learning math does not equal mastery. A person studies math for a year to learn basic arithmetic, another year to learn algebra, another to learn geometry, etc.
Let’s put telekinesis like this. Move a small pebble is basic arithmetic, moving a lightsaber is algebra, moving an x-wing is geometry, moving several pebbles is trig, etc. Jedi train for years and slowly acquire these skills and masters like Einstein use their knowledge to further push the barriers of the force.
Rey went from not knowing any math to having a PhD level proficiency cause she was exposed to it once.
And the force potential was strong, she just needed to control it is silly. Anakin is basically a being created from the force and is pretty much the force in human form. In his duel against Obi Wan in episode 3, Anakin and Obi Wan’s Force push clash was equal since despite Anakin’s greater potential, Obi Wan’s greater proficiency covered that gap (Obi Wan is confirmed to have lower force proficiency than Anakin). There are “levels” of proficiency which Rey skipped to mastery.