What is the right religion? who to worship?

You asked a good question. And I want to believe that the desire to understand, driven from your inmost inward self propelled you to seek answers, hence your question.
Thus, with love for the world and humanity, I shall try to help you in my own way. Yet, this help is not limited to you alone, it is meant for all who will seriously take the trouble to follow it without delay. The benefits however, as you will later on discover, are priceless. No amount of earthly riches can compare with it. Take the trouble and be FREE at last!

Religion irrespective of what the dictionary says is simply a social construct, a medium from man towards his God. An attempt to understand a mysterious, Almighty sublime Being whom we consciously or unconsciously sense to exist.

Because religion is a bridge from man to God, there is bound to be errors here and there. And where there are errors regarding faith, and believe in God, something imperfect is. There, the can never be a right or intelligible recognition and conviction in God and his commandments. And man needs this recognition of God and a sound unshakable knowledge of his commandments to enable him walk safely without errors on the road which he should walk on.
Without the right understanding and knowledge of God's commandment, the will be errors and, ... failure.

It is just the same as having an operator's manual for a machine written by the manufacturer of that machine. Without such a manual, one can endanger his life or cause damage to the machine. Surely, we experience similar and much clearer cases in our day to day lives.

Now, man carries the inner awareness of his God. He knows about it! The question of 'science vs religion' in the first place "dares" to be a question because of a lack of or distorted enlightenment. The can never be a question of "does God exists?" because the creations clearly attests to fact that he does exist. As an instance, think of the orderly architecture of the solar system and then compare it to the elementary atom, which is the smallest part of all matter: the structure is basically the same. Would that have happened by chance, as gigantic as the planetary systems are? As infinitesimal as the atom is?
This is proof that a Being deliberately creates. And He deliberately puts in his creation laws ( like the operator's manual) to govern the activities in his creation. And man needs the knowledge of this laws to be able to function optimally in this creation which he is a "dispensable" part.

These laws are automatically responsible for karma, if transgressed. They answer the question why some people are rich, others are poor. Why some people are black, white, yellow, brown, etc. Why some people are born blind, etc. Why some people are good, others are bad. They answer everything, every question one can think of!

Man has constantly tried to aim at an understanding and conception of his God in his unending seeking. He even carries this urge to constantly seek or investigate within him. We always want to know "what is in the other side" , we are constantly pushing our limits, expanding our horizons and wanting to know better. We are hardly tired of this!

And also, we carry within us that longing to know our creator, Almighty God. He himself gives it to us as a gift because he knows that it is for our own good.
And we express this longing through religion, manifold as it is.
But in doing so, we have again and again introduced errors of a varying kind.

The Almighty has always spoken to humanity through his numerous messengers. Among all peoples, in all ages, He has always sent forth His message through His messengers. This message contained the truth from out of him. It was meant to explain His living commandments in such a manner that we could understand and execute in obedience. Always, through time, in love, His messengers have been sent forth by Him to fulfill His will to us. It was our duty to obey this will. But we always failed.
Thus, Krishna came amongst the Indians, Mohammed in Arabia, Zoroaster in Iran, Buddha, Moses amongst the Israelites, ... And Jesus Christ Himself who Is the Son of God. They all brought the message of God and his laws. But despite this great love of the Almighty towards small human beings, His messengers were always received with hostility and defiance.

But one still wonders why many human beings still hold tenaciously to the belief that there is no God. It really bits my wildest imagination. It is the greatest self lie. The greatest self deception. To convulsively hold to the stupid opinion that the is no God! Whoever will not rethink his opinion in this matter has himself to blame. He will be lost! Because this knowledge offers him a strong basis for spiritual growth. Atheist, take note!

For the Almighty IS. HE CREATED THE HEAVENS AND THE EARTH.

Now, these messengers brought to us, and for us the true message of the Almighty. We received it, each understanding it in his own way. Then in the course of transmissions, we inadvertently or even deliberately added our own opinions to the original. And this became the foundation of so many errors.
Even amongst us today, in different denominations, beliefs, sects, etc, of Christian faith, there is dissension of what to believe and what not to. This is clear enough evidence that our religious institutions are on a wrong foundation. Not to talk of what is preached there as faith.

In the present day confusion and utmost chaos befalling the whole of humanity, such that humanity knows not her left from her right, in a time where the is unspeakable distress, suffering, natural catastrophies, distrust among nations, hatred and envy of the basest kinds, murder, famine of epic proportions, deseases, fire, hurricanes, drought, etc. Hardly a day passes without one tuning a news channel and listening to news without one dreadful happening or the other. If it is not suicide bombs today, then it is accident of any kind tomorrow.
Despite the many councils and counsels in any matter (EU, AU, BRICS, G8, IMF, NATO, FIFA, etc) humanity is defenceless against all these unfolding disasters.

And in the midst of all this turmoil, the word of God rings out ever louder, ever brighter as the LAST help and hope of salvation for mankind. Whoever will not listen again will be lost for good. Whoever will not strive to read and grasp its content aright, and strive to leave accordingly has himself to blame, whoever will say: "Ah, it is just another type of the many religions" has himself to blame. There will never be another of such opportunity! It will be gone and gone for good. Just as he will be eternally lost and lost for good!

The Almighty does not solicit for our obedience, we are the ones who need him! He does not need us. After all He is the one that created and sustains our existence. It is our duty to approach Him in right worship because such a practice is for our own good.

Worshipping of the Almighty does not necessarily require religion because each one of us carries within him the ability to independently approach his creator.

And alas, ladies and gentlemen, with great thanks to Him, the source of all life, Almighty God the Father, I introduce you to the Grail Message: "In The Light Of Truth", by Abd-ru-shin. The last saving help from God to man. The necessary indispensable help. The torchlight in darkness. The staff that never let's you fall. The book of creation, the manual of the creation of the creator. His final message to us all.

Happy is he who earnestly and vigorously seizes such a wonderful opportunity.

"In order to convey to mankind such knowledge, which gives them a clear and intelligible conviction of the working of God in His Justice and Love, I have written the work “In the Light of Truth”, which leaves no gap, contains the answer to every question, and clearly shows to mankind how wonderful are the ways in Creation that are upheld by many servants of His Will.

But God alone is Holy!"

Abd-ru-shin (Author of the Grail Message)