Sadly funerals have not intentionally been a theme for me, nor is death or the death of people around me per se, but I have been to or should have been to 4 funerals this year (had two at same time so only went to one).
So what is important to say or know at a funeral? That you told the one that passes how much you loved them? Maybe but not really that is about you; they are gone so it is no effect them, truly it is to the people that are there to know there is hope even in death.
You can be saved you can spend eternity in heaven, you who are living you need he hope. The person passed either had that hope or they didn’t so the goal is to make sure you understand what you can do for you.
Take a step back belief in God, in heaven, in love, in hope what detriment is that to you? Extra sleep, a missed addition, a missed hurt what do you have to lose? You through a belief can ‘try God’ he’ll come through, you can fill a void you have in your life, can you relinquish control of your life enough to know that your successes have been Godly principles that worked in your life even through the absence of acknowledgment of God, they still work! The failures and sadness you have had is a part of a fallen world in which we live or your wrong decision to not follow what you knew to be “Right”.