A simple but beautiful answer to this question was posted on Quora, but the link wouldn’t post here, so I will quote both Question and Answer here in slightly edited and condensed form.
I have a very general question to ask that might be a bit vague but I think I am in need of affirmation from like-minded people who I know to be rational, honest, and faithful. Because I’ve had periods when I’ve been really struggling with faith recently which is difficult for me to admit. I really want to believe and I want that belief to be strong. And so I’m asking you in an attempt to see truth and wisdom in your perspective of why you feel God to be present and listening. What motivates you to believe in and have faith in God? What are the intellectual and instinctive reasons behind you choosing to believe in a higher power? And how do you protect your mind and soul from wavering doubts against that faith that you hold so dear? These questions are less about Islam specifically but more about the broader concept of there being God in general. Though if your response links to Islam or Quranic guidance that is very much appreciated.
Honestly, it is very hard to describe why I believe there is a higher power. The reasoning or feeling behind it varies person to person and we truly cannot make anyone believe (the same thing is said in the Quran that we can’t guide anyone).
But one thing is most important in my life. Today is my mother’s death anniversary. I can’t explain how much I miss her. Every single day I remember her. When I cook, I remember how tired she looked when she cooked for me. Same feelings appear in my mind when I wash clothes, do grocery shopping or feel sick. I didn’t even look at her dead body. It seemed like someone else’s body. She has become an abstract body from that day. She is her smile. She is her thoughtfulness. She is her love for us. She is her humbleness. She is her service for us. I can’t explain how strong her abstract concept is in my mind.
If there is no God, she is not present anywhere, anymore. But that’s not my main reason for being a theist. If God doesn’t exist and soul doesn’t exist, her love for us is nothing but some chemical reactions. If I believe that souls exist, her whole memory becomes too precious for me as her beautiful soul was the builder of those memories. But if souls don’t exist, those memories have no value. Her actions were products of chemical reactions. She was then just an animal who was born, bred and got decomposed. Without the existence of God, even a mother’s love is not beautiful.
I could have talked about the complexity of DNA that atheists believe is random. Even if I take that argument, it simply feels unlikely to me that the poetry that comes in our mind when we look at our partner OR the mother-child bond OR how an act/example of kindness makes our eyes wet, all are just random actions and no soul is present behind the scene. Everything just becomes valueless if faith in God (the creator of the soul) doesn’t exist.Source: https://maharizma.quora.com/INBOX-QUERY-Hi-Maha-why-do-you-FEEL-that-God-exists
And there’s an aya for this from the Quran, where ”spouses” could be also any loving relationships:
وَمِنۡ ءَايَٰتِهِۦٓ أَنۡ خَلَقَ لَكُم مِّنۡ أَنفُسِكُمۡ أَزۡوَٰجًا لِّتَسۡكُنُوٓاْ إِلَيۡهَا وَجَعَلَ بَيۡنَكُم مَّوَدَّةً وَرَحۡمَةًۚ إِنَّ فِى ذَٰلِكَ لَأٓيَٰتٍ لِّقَوۡمٍ يَتَفَكَّرُونَ
And of His signs is that He created for you from yourselves spouses that you may find tranquillity in them; and He placed between you affection and mercy. Indeed in that are signs for a people who give thought.Ar-Rum 30:21