Booger, I think that both of those arguments are self-defeating. I will give a few reasons.
First, neither of those arguments even consider that God does provide enough evidence to believe. It seems that if there are hard-core atheists who have converted to Christianity, then there is obviously enough evidence to reach theistic conclusions.
Secondly, neither of those arguments acknowledge the fact that people can mold any evidence to fit their pre-determined worldview, or can just ignore the evidence altogether. The arguments against God that were just presented illustrate this fact perfectly. To put it simply in order to keep this thread on topic, both arguments show both/either a) a lack of understanding of the concept of free will and/or b) complete ignorance of the Christian position.
The arguments presented fail to acknowledge any of these things. Now, us theists could take the bait and go against the threadmaker’s wishes and discuss the proofs for God’s existence, but that would be both unproductive and mean to the threadmaker. Even if we did take the bait, the arguments you present make me wonder if you would listen. The arguments presented portray a very simplistic view of God. How can an atheist truly say that God has not presented enough evidence for His own existence when the atheist clearly hasn’t gone out searching for the evidence?
Which ties me back into the topic of the thread: faith is a gift, as all Christians acknowledge. God will not condemn someone if they do not inherit a gift that He has not given them. However, He will not have mercy on them if He is trying to give them the gift and they don’t accept it. This happens in one of two ways: either the atheist (or any person for that matter) ignores the evidence, or the atheist never bothers to seek God in the first place.
No person knows what lies in a man’s heart, so the original question of this thread is too broad. If an atheist seeks God with all his being and never finds God, then God will surely have mercy on him. We cannot simply condemn or affirm all atheists: just as God loves each person as if only he/she exists, so will God judge each man. He will not judge atheists as a group or Christians as a group.
To all of the atheists reading this, I will not judge your soul: I’ll leave that to God. However, if you see nothing wrong with the arguments against God’s existence that were shown above, please don’t even bother trying to convince me that you’ve given a moment’s thought to the Christian position. If you don’t understand why, then it may behoove you to do some reading.
Peace, God’s love, and happy hunting.