Curious to why people think Saitama can interact with infinity
Because Saitama has casually shown the capability to interact with space-time folds, higher dimensional scaling, spiritual spaces, and intangible spirits. If those aren't separate abilities, but one in the same, then he would be able to interact with spiritual space-time folds. Also, more importantly, it would be funny if he could. Read below if you want a detailed breakdown.
Having multiple unexplained casual feats like this I would find it weird if he couldn't move infinity tbh, especially with verse equalization here.
First, moving space-time/higher dimensional folds via kicking and then later pulling a hyperspace gate. What is hyperspace? Well it's a fourth dimensional causeway. The gate itself is the 3-dimensional hole, which requires folding space time across unknown distances for the causeway part and may require further folding in order to manifest in a way our 3d eyes can- or just passively appear as such. That second bit is somewhat speculative, but it shows that Saitama can displace space-time folds in 3 dimensions while affecting the 4th dimensional component.
Secondly, transdimensional movement and spiritual interaction via entering the Phoenix Space. This is obviously some other kind of dimension. What kind of dimension? Well, Phoenix Man describes it as a spiritual space- which isn't far fetched- PM literally quotes the Genesis from the bible when he resurrects people "
ܗܘܐ ܢܘܗܪܐ", and as we see with the ninja bros he resurrects, souls do seem to exist independent of the body. Garou's interdimensional ghost seen at the end of his fight with Saitama really hammers the existence of spirits and spiritual in OPM home.
Thirdly, Saitama is able to interact with Phoenix Man's spirit/mental image/ego/whatever when he is explicitly stated this is not possible.
So if he can move space-time folds whose 4th dimensional components infinitely transcend 3d space (mathematically speaking), travel between dimensions via brute force (which is an inquantifiable distance that could be construed as infinite) and interact with spiritual energy by proxy, I think he should be able to grab Infinity like he grabbed the hyperspace gate