Henry has 2, Ronaldo 3. Not exactly a huge difference.
Actually Salah put up a figure that is unmatched, 32 PL goals in a season. Also has more goals (110 vs 90) and assists (43 vs 36) than Ronaldo in the PL in 35 less games (basically an entire season less). Ronaldo was undeniably better at the end of his Utd career and reached a higher peak, and trophies is definitely an argument in his favour as well, but as for purely stats, Salah is definitely up there in the conversation if you're comparing him with Henry and Ronaldo.
For me personally he's not up there though, I wouldn't rank him ahead of the likes of Gerrard, Giggs, Lampard, ... either. Might come closer or overtake those players if he stays a few more years at Liverpool (and wins some more trophies). Depends on how you look at it though and which criteria you take into account.