Atheists, what are the most convincing theist arguments you heard of?

[Neo-Scholastic]

The Kalam argument is nonsensical.

I understand the sentiment because it is a poorly constructed version of the Prime Mover, the First Way of Thomas Aquinas. As such it appears to beg the question, by stating a condition for beings (coming into being) then seems to make an exception for a being with the unique feature of not having come into being. The missing premise that clarifies the demonstration is the continuum of existence from actual being to potential being.