Direct prayers to God are essentially direct prayers to your own spirit and higher Self; for there is no separation between the two except in your current thought processes. The will and wonderment of God is no different to the will and wonderment of that source which is your spirit. This means what God wants and aspires for you is the very same thing as what your spirit and higher Self wants and aspires for you. By connecting and conditioning your prayers, your intentions and your energies towards that which is your spirit, or higher Self, you invoke forward the wisdom and wonderment of God into you. That which is God will always, in all ways, speak to you through you, as part of you, as you are a part of it.
The challenge that many human beings have is that they readily acknowledge the power and greatness of some unseen, unheard deity persona, and invest very little of the same faith into the capacity and capability of their own spirit presence. The spirit of all living things, regardless of its physical form, need to be given the same prestige and reverence as human beings cast upon their deities. Do not judge spiritual power by physical appearance. If one fails in this understanding then they fail to understand themselves and all other beings in the universe.
What this is suggesting to you is that by praying, or doing these other intentful and invoking practices of love towards your own spirit or higher Self, you will facilitate not only an equal condition of response, but often a greater and more identifiable condition of response. What your consciousness is basically doing is placing trust in your own inner power and thus allowing that power to manifest something in your life by inviting that to happen. You do not need these other spirit personas or alleged masters to create your own miracles. You simply need to recognise the miracle you are.
Praying to something or someone you do not understand always raises potential problems for you are not attuned to their vibration in order to reach them directly. Unfortunately many of the beings you might refer to as Archangels, God or ET Masters are so beyond your reach in terms of vibrational compatibility that communication (as you would desire it to be) would simply not be possible. For if at all they should reply, their response would be so potently full of love that the very experience of their reply would completely overwhelm you, and likely end your physical life. You would simply cease the will to live as a physical being and become completely unrooted and ungrounded, fall into a coma, lose your mind or pass over immediately.
What I have come to observe is that various parties within the spirit world will actually create mechanisms and design instruments which work to filter and funnel forms of communication down to specific physical beings on Earth. These are overall quite rare to see and are only implemented by those who lean towards a scientific mode of communication.
In terms of prayer it is most likely you will be more successful with forms of thought transfer and prayer to loved ones you knew upon the Earth who have now passed over. This is because your consciousness and energy state still retains a vibrational awareness of that individual, and when thinking of that individual you automatically connect to their specific vibrational signature in the spirit world. This is to say, most of the time, your loved ones are aware whenever you are directing a thought to them should you wish to say something to them. Your doorkeeper or soul guardian, who remains at your side permanently, is always aware of what you are doing, or attempting to do. There is never a time when you are alone. Though your privacy is understood and respected.
I wish to make a suggestion to you that instead of attempting to connect to a specific spirit guide of whom you know nothing about, you in fact speak and send your prayers to your very own spirit source. In doing so there is never a time when you cannot be heard for your vibration will always remain compatible with that of your own spirit. You will also be able to recognise your own energy presence. You must trust yourself and your own spirit completely to have the wisdom and the capacity to do what any other being in the spirit world can do, for such is the truth of it.
Indeed, just because you are sending energy and thoughts out into the etheric world you cannot be naive in thinking you are simply going to get what or whom you ask for every time. It is a matter of proximity of who or what is in compatibility with what you are sending out and what exactly you are sending out, why you are doing it and where you are doing it. The actual physical geographical location will have an effect on what you are sending out and what is received. The intent in what you are asking for will also effect how it is sent out and who perceives it. It is always wise to ask your own spirit or those who watch over you to place filters of protection upon you before inviting in energies or entities of unknown origin. You can do this by authoritively commanding your own energy space to wield to your will and coat you in an envelope of your own purest vibration and inner light. Collate the love energy between those of your group and forge it into a bubble around you, which will then also act as a vibrational antenna.
What you must understand is that when you invite beings of the etheric domain into your personal space, they will always seek to use the energy around you in order to connect with you and remain in your presence. This is to say, the energy you set up around yourself prior to prayers and other forms of communication is very important, for this is the energy other beings are going to be drawing on to get close to you. It is my advice then to always cleanse the physical environment prior to you wishing to reach out into the etheric world, as well as your own state of being and those within the group you may be in. And remember, do not automatically presume all beings are who they say they are just because they can imitate kindness. Yet I say to you, do not be afraid or downhearted by one negative event, for there are many beautiful opportunities to be created.