The answer may surprise you…
Do Catholics have to Assent to Non-Infallible Church Teaching?
On Dec. 31, 1930, Pope Pius XI issued his landmark encyclical Casti Connubii on Christian marriage. In it, the Holy Father reminded Catholics that it is not permissible to prefer one’s own judgment over that of the Church on matters of Faith and morals. A Catholic is not allowed to accept from the Church only what seems correct to him, nor can he decide to withhold his assent from teaching that is not presented infallibly:
Wherefore, let the faithful also be on their guard against the overrated independence of private judgment and that false autonomy of human reason.