Why Catholicism?
For hundreds of years - among earnest seekers of Christ’s will - a number of diverse reasons in favor, and a diverse number of reasons in opposition.
The Catholic Church is the oldest institution in history. But, old can mean senile. So, old, per se, is not necessarily a value. For nearly forever, the Catholic Church believed the Sun rotated around the Earth.
The Catholic Church was the reigning Church, in the formation of the biblical canon. Yes, but what men thought then is not always substitutional for what men think now. Scholarship shifts. Genius of antiquity is no protection from idiocy of today, and vice versa. So, no necessary merit there, either.
The Catholic Church claims inception with Peter. But, a claim does not proof make. Interpretation of what Jesus said to Peter is unsettled among biblical intellectuals. So, no go there, either.
History shows the one true Church of Christ, His Church, is manifested in a number of branches and denominations: Catholic, Protestant, and Orthodox.
Each of the branches has contibuted to the whole, though each is rife with highly debatable and contentious issues.
Of course, each member of his/her branch is convinced that only he/she is enlightened.