I recently watched the movie, "God's Not Dead". It was very well done and I loved the systematic way that the student in the film destroys all of the arguments of the liberal professor! No, we cannot "prove" the existence of God, but no one has EVER disproved Him! EVER! The Bible tells us in Romans 1:20 that creation itself speaks of the presence and power of God! IF people WANT to know Him, they can! The choice has always been ours to make! Look at Romans 1:20-23:
20 For ever since the creation of the world His invisible nature and attributes, that is, His eternal power and divinity, have been made intelligible and clearly discernible in and through the things that have been made (His handiworks). So [men] are without excuse [altogether without any defense or justification], [Psalms 19:1-4.] 21 Because when they knew and recognized Him as God, they did not honor and glorify Him as God or give Him thanks. But instead they became futile and godless in their thinking [with vain imaginings, foolish reasoning, and stupid speculations] and their senseless minds were darkened. 22 Claiming to be wise, they became fools [professing to be smart, they made simpletons of themselves]. 23 And by them the glory and majesty and excellence of the immortal God were exchanged for and represented by images, resembling mortal man and birds and beasts and reptiles. AMP
Shalom in Him!