3. As an instrument to realize the Truth
Even though you may conceptually understand closely what high level religion is, you may never have come across the highest level of that religion.
As you may already know, there are various levels even in the same religion. Even though the word, Chong Gyo(religion) is used as a common term, each religion cannot but vary completely in terms of quality.
For example, many Buddhists do not properly understand the Buddhist law of Cause and Effect, Four Noble Truths, Twelve Links of Interdependent Arising or Twelve Limbs of Dependent Origination, Noble Eightfold Path, and Sunyata(Emptiness-Existence Relationship), Bodhisattva Path, and Tathagata's Knowledge. It is frustrating to see that many Buddhists are entrapped in foolishness and practice "praying to Buddha for blessings". Of course, it is also a fact that there are many believers who are not like that.
Praying to Buddha, Invocation of Buddha's name, Sutra Recitation, Zen(Seon in Korean) Meditation etc. should be practiced as an instrument to help sentient beings awaken to the Truth. Contrary to the original intention, they have been misused and modified as if to say "Please help me have a good life" or "Please give me good health."
This is only an elementary school level to the view of true Buddhism. If you think this is what Buddhism is, you won't have any response to someone's statement that Buddhism is really a foolish religion.