[GeronL]

No, the most common problem is that people attribute miracles to humans instead of God and then humans pretend to elevate those humans to heaven as “Saints”

[JPII Be Not Afraid]

Only God can preform miracles. We ask holy people who have died and we believe are in heaven to intercede to God on our behalf. If it is God’s will that we should receive that particular miracle, He will allow it to show us that the holy person was pleasing to Him by his virtue and life, and that they are a good example to emulate for our own faith journey.

[Wyrd bið ful aræd]

Your understanding is skewed. Nobody can be elevated to Heaven -- we can merely conclude that it is very likely that a particular person is there.

One flock, one Shepherd. Believers united in Christ pray for one another and assist one another, and physical death does not separate one (one who is saved that is) from praying for his fellow believers. Just like any other member of the flock, a Saint can pray for his fellow believers, and if a person has been brought into Heaven by God and is closer to God than we on earth are as of yet, his prayers are more pleasing to God. So, it makes perfect sense that we request that that person pray for us.

[Elsie]

No, the most common problem is that people attribute miracles to humans instead of God and then humans pretend to elevate those humans to heaven as “Saints”

Almost...

It's that people tend to think that SATAN cannot produce 'miracles' that would lead people to a godly direction.

Even though Scripture gives CLEAR warning.