You! The Best argument of the existence of God

You exist, and as much you may wish to you cannot deny it. That's the best argument to know there is a merciful God.

Honestly... many seasonings and different arguments could develop if you accept the latter premise and this other: Some Years ago you didn't exist or at least you weren't aware but now you do.

I'm enjoying the reading of an awesome book (who does not cite my "argument", but I guess he will agree that this change in existence or knowledge suffices  to get the ball rolling): Five Proofs by Prof. Edward Feser. Recommended for everyone, especially those who fear philosophical jargon.
https://www.amazon.com/dp/1621641333/ref=cm_sw_r_cp_awdb_Tvn2zb5Z1JYR2