There are people with the best of intention who believe that Mary’s intercession is idolatry and a type of paganism under the guise of Christianity. Their reasoning is that if we ask Mary’s intercession, we are at odds with Jesus because He said in John 14:6, “no one comes to the Father except through Me [Jesus].” To them it means that we should... only ask Jesus to intercede to Father, and Mary is considered to be an adversary to the process rather than a help.
This understanding is in conflict with Jesus teaching on prayer. Jesus said; "This is how you are to pray: Our Father in heaven, hallowed be your name, your kingdom come, your will be done, on earth as in heaven. (Mt 6:9-14). Notice that Jesus is telling his followers to pray directly to the Father. Jesus is not saying you can only intercede to the father through Me.
Jesus didn’t say, no one INTERCEDES to the father except through Me. Jesus said, “no one COMES to the Father except through Me” [Jesus] (Jn 14:6). Please note that intercessory prayer by Mary or anyone is not in the context. Jesus, in John 14 tells us that He is going to prepare a place for us and he will come back and take us with Him, verse 3. No one comes to the father except by Me, verse 6. Jesus is coming back and He will not leave us orphans, verse18. .
How does Jesus leave and prepare a place for us? Jesus dies on the cross He raises from the dead and ascends into Heaven! By His cross we are redeemed. No one can COME to the Father except through Jesus because He redeemed us on the cross. Without this redemption there is no salvation and so when Jesus is referring to “coming to the Father,” He is not saying who can or cannot intercede. He is talking about salvation; “There is no salvation through anyone else, nor is there any other name [Jesus] under heaven given to the human race by which we are to be saved." (Acts 4:12).”
Some people are using John 14:6 as a prohibition against Mary and the saints interceding in prayer; however, they are using it out of context, probably not realizing John 14:6 has to do with redemption and not intercession.
We ask Mary and the Saints to pray with us on our behalf. Yes, we go straight to Jesus and when Mary intercedes on our behalf, she goes straight to Jesus along with us. In the Bible when the wedding party was out of wine, Mary interceded to Jesus on their behalf. Jesus initially resisted "my hour has not yet come" (Jn 2:3-5); however, Jesus out of His great love honored His mother Mary, by doing it anyway. I want Mary on my side when I pray to Jesus, and that is why in every Hail Mary prayer we say to her "pray for us sinners now and at the hour of our death." We ask Mary to intercede with us and she goes straight to Jesus, just as she did at Cana.