One can pray to one, but how does one know they can hear you? According to the ancient Hebrews who were inspired to write the Psalms and other passages, the dead are not ablle to praise Yahewh.
NAB Psalm 115:17 (1 )The dead do not praise the LORD, all those gone down into silence.
NJB Psalm 115:17 The dead cannot praise Yahweh, those who sink into silence,
That being the case, how can they help you?
Psalm 115:
115 1 Not to us, O LORD, not to us, but to thy name give glory, for the sake of thy steadfast love and thy faithfulness!
2 Why should the nations say, “Where is their God?”
3 Our God is in the heavens; he does whatever he pleases.
4 Their idols are silver and gold, the work of men’s hands.
5 They have mouths, but do not speak; eyes, but do not see.
6 They have ears, but do not hear; noses, but do not smell.
7 They have hands, but do not feel; feet, but do not walk; and they do not make a sound in their throat.
8 Those who make them are like them; so are all who trust in them.
9 O Israel, trust in the LORD! He is their help and their shield.
10 O house of Aaron, put your trust in the LORD! He is their help and their shield.
11 You who fear the LORD, trust in the LORD! He is their help and their shield.
12 The LORD has been mindful of us; he will bless us; he will bless the house of Israel; he will bless the house of Aaron;
13 he will bless those who fear the LORD, both small and great.
14 May the LORD give you increase, you and your children!
15 May you be blessed by the LORD, who made heaven and earth!
16 The heavens are the LORD’s heavens, but the earth he has given to the sons of men.
17 The dead do not praise the LORD, nor do any that go down into silence.
18 But we will bless the LORD from this time forth and for evermore. Praise the LORD!
The verse you refer to speaks of the sons of man given to the earth as those who did not and do not praise the Lord and who are dead in spirit. Its not that they couldn’t praise God because they were dead, but rather because they did not praise God, they are dead.