I have seen many Atheists here who seem to have an unwarranted justification for their Atheism because their reasons for disbelief are actually flawed or countered by other sophisticated arguments from Theist apologists and philosophers. I will present one argument FOR God that I find to be respectable, interesting, and quite effective.
The Argument from Contingency
P1: Everything that exists contingently has a reason for its existence.
P2: The universe exists contingently.
P3: Therefore, the universe has a reason for its existence.
P4: If the universe has a reason for its existence then that reason is God (a non-contingent, necessary being, i.e. a being that logically could not have failed to exist.).
C: Therefore, God exists.
Explanation of the argument:
This is also known as the "Modal Cosmological Argument," but it doesn't suffer the same weakness as the Kalam Cosmological Argument because it doesn't rely on the premise that the Universe had a beginning, and is actually compatible with an eternal Universe (however, I can actually poke holes in the argument I presented, but I won't do it here cause I want to see if you guys can come up with objections.)
Contingent things are not necessary and could have failed to exist. Their existence is always dependent on something else. The argument proposes that everything in the Universe is contingent and even the Universe itself is contingent, thus could have failed to exist. And if the Universe is contingent, then it requires explanation for it's existence which must be either another thing that is contingent, or something that is non-contingent. Thus, the ultimate explanation for the existence of all things, the Universe, is a necessary, non-contingent being which could not have failed to exist.
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