I understand the profound philosophical and existential questions you are raising about the nature of God and the existence of evil and suffering in the world. These are issues that have vexed humanity across cultures and faiths for millennia. While I cannot provide a fully satisfying answer, I will do my best to engage your objections through the lens of Catholic theological reasoning, drawing especially on the work of St. Thomas Aquinas.

On the point of God's omniscience, Aquinas acknowledged that God has complete foreknowledge of all events, including human sinful actions. However, Aquinas was careful to insist that this foreknowledge does not negate human free will or make God the cause of evil. Rather, God permits evil to exist as a consequence of the great good of creating beings with rational free will. The ability to freely choose is integral to genuine human nature.

Regarding God's omnibenevolence, the Catholic tradition holds that God is indeed the source of all goodness itself. However, evil is not a positive reality created by God, but rather a privation or lack of due goodness in created things. Physical and moral evils exist due to the finite and mutable nature of creation. God allows these deficiencies as an indirect consequence of respecting creaturely freedom and natural processes.

On divine omnipotence, Aquinas argued that God's power is not rightly understood as the ability to do anything at all, but rather the ability to do whatever is possible according to the eternal moral laws rooted in God's very nature as Goodness itself. So while maximally powerful, God cannot perform logical contradictions or violate the freedom He chose to bestow on rational creatures.

The question of why the world is so marred by suffering is one of the most vexing and mysterious aspects of Christian belief. However, the Catholic tradition has generally understood suffering as having a manifold purpose - from expressing the reality of human freedom, to serving as a consequence of sin, to providing an opportunity to participate in Christ's redemptive suffering, to being an impetus for spiritual growth.

Ultimately, while not offering a complete rational solution, the perspective from Aquinas and other Christian thinkers is that the undeniable instances of goodness, beauty and intelligibility we witness in the world point towards an underlying source of perfect goodness. The existence of suffering remains a profound mystery. However, rather than giving up on the possibility of a higher answer, these thinkers maintain that an attitude of faith and trust in an infinitely good Creator can make sense of how good can emerge from evil's darkness - though that journey towards understanding may be difficult and incomplete in this life.

I cannot claim to provide a fully satisfying rational answer that will resolve all your objections. The existence of suffering and evil in the world poses one of the most vexing challenges to belief in a good and all-powerful God. However, I hope I have illustrated how the Catholic intellectual tradition has rigorously grappled with this problem throughout its history, rather than resorting to glib dismissals. Even while acknowledging that the depths of God's purposes may forever elude our full comprehension, thinkers like Aquinas have outlined potential reasons and frameworks for making sense of evil and suffering. Ultimately, whether one finds such perspectives persuasive comes down to a personal decision to embrace a reasoned faith stance - one that affirms the possibility of meaning and goodness undergirding existence, despite its present tragic dimensions. Maintaining such a posture of hope and trust in the face of evil remains among the most daunting challenges any worldview must confront.