A modified version of Arguments Against Agnosticism

1)

Practical atheism means mans life is indifferent to the existence of god as the ultimate end of man's moral action.

Agnosticism concludes that god may or may not exist and there is not enough evidence to know either way concerning god’s existence.Agnosticism is therefore indifferent to the existence of god.Agnosticism is therefore indifferent to God as the ultimate end of man's moral actions.Agnosticism is therefore practical atheism.But atheism is false (as shown in the post discussing problems with atheism).But agnosticism is a form of atheism as practical atheism.Therefore agnosticism is false.

2)

Agnosticism concludes that the existence of god cannot be known.
But the human intellect is ordered to know the nature of bodies and therefore being.
God is a being.
Therefore man can know that god exists through analogy from the created order to the uncreated order through the knowledge of being.
Therefore agnosticism contradicts the nature of mans ability to know natures and being.
What contradicts man's knowledge is false.
Therefore agnosticism is false.

3)
Agnosticism concludes that the existence of god may or may not be known.
If the existence of god may be known, then man can know a being that is not a body, but is a spirit.
A spirit is more unlike a body than like a body.
As man knows natures through bodies, then man knows a spirit by analogy from a body.
As god is a spirit, then god is known through analogy from a body.
As analogy is commonly used by man as a valid form of knowledge, and God can be known by analogy, then agnosticism is false.

4)
Agnosticism concludes that it is not possible to know that god exists.
Yet man knows of the existence of god as the first cause, mover, perfector, necessary being and orderer.
Therefore man does know of the existence of god under the character of first cause, mover, perfector, necessary being and orderer.
Therefore agnosticism is false.

5)
Agnosticism concludes that it is not possible to know the nature of god.
Yet natural theology concludes that the nature of god is divine, whereby He is the subsistent being, which exists simply, containing all perfections either formally in the divine nature, or virtually, according to power.
As the divine nature is known through reason and by analogy from creatures, then agnosticism is false.

6)
Agnosticism concludes that the nature of the supernatural cannot be known in God.
Yet the existence of the supernatural is demonstrated from reason as follows.
Every being is common to other beings in so far as it has actions in common to other beings
Every being is distinct from other beings in so far as it has something proper to it alone and not to other beings.
The supreme being has perfections that are both common to all other creatures, yet the supreme being is unlike all other beings which are not supreme.
As the supreme being is unlike all other beings, the supreme being must have a perfection that is unlike all other beings.
As all other beings are natural, then the supreme being has natural perfections in common with other creatures and perfections that are proper to it alone and thereby unlike creatures.
A perfection in the supreme being that is unlike natural creatures is not natural, but supernatural.
But agnosticism concludes that we cannot know that the supreme being, nor the supernatural order exists.
Yet deductive reasoning demonstrates the supreme being, nor the supernatural order exists.
Therefore agnosticism concerning supreme being, and the supernatural order is false.

7)
Agnosticism concludes that the nature of the supernatural cannot be known.
Agnosticism then concludes that neither reason, nor faith has access to the supernatural in God, nor any evidence in creation for the supernatural in the supreme being (called God).
Yet God is supernatural (as shown above) and has chosen to intervene in history through supernatural actions such as prophecy, healing and other miracles (as part of Christian revelation).
As these miracles are true (such as Christ's resurrection), then the action of God in history is also true.
Those miracles have been accompanied with a divine teaching that has informed man through public revelation concerning the nature of the supernatural life in God.
This supernatural life in God is the life of the Trinity as Father, Son and Holy Spirit.
As God has told man of the nature of the supernatural life which is then known by men through faith, then agnosticism is false.

JM