I love my earthly parents and siblings a great deal, and think of them often. I’d hardly say that I find it a ‘must’ to put pictures of them in every room of my office for me to think of them. And I don’t. The thinking of them comes naturally out of my love for them, regardless of presence or absence of external aids.
Same with my Lord. Yes, I do have crucifixes and religious images in my home. I also wear a cross and a rosary bracelet. None of these are ‘more or less a must’ for someone who loves God as they ought.
On the contrary, the love of God came well before I purchased any of them. And I can assure you I love God and think of Him every bit as much on the days I forget to wear my bracelet or cross.