Jesus told his disciples that he will return only once and that when he does, after a time of great tribulation, it will be visible to everyone and be followed by immediate and dire consequences for those unprepared and for those who were adversaries of God.
A look at the bible Students and different Jehovah's Witnesses regulations or prescriptions and rules for undergoing baptism.
Always there have been real followers of Jesus who only worshipped his One God, the God of Israel. Many centuries they worked and preached behind closed doors, avoiding persecution and death on the balefire. In fear of the stake for centuries the real followers of God baptised people in their faith, not demanding to be part of one or another church but being part of the Body of Christ.
Often a lot of people do not know to differentiate between Christendom, Christianity, religiosity and even limit religiousness to Christians, forgetting that there are many other religious groups who have all sorts of worship.
Peter evidently did not view himself as the rock on which Jesus would build his congregation, since he wrote at 1Pe 2:4-8 that Jesus was the long-foretold “foundation cornerstone,” chosen by God himself. Similarly, the apostle Paul referred to Jesus as the “foundation” and “the spiritual rock.” (1Co 3:11; 10:4). For every Christian or follower of Christ their church or community should have Jesus as their cornerstone and not as such one or another hierarchical religious organisation.
Trinitarian Christians claim to be monotheists thought their subgod Jesus has lesser qualities in common than many polytheists their main god and subgods. God may perhaps not to be found in perceivable attributes but when looking around and reading the Bible like the words are written in that book then it should not be so difficult and not so confusing to come and see Who God really is.
Though many things may be very difficult to proof that does not mean that they would not exist. Also feelings and experiences are difficult to proof, though the results of a God-Being in our life is something what many feel. One thing is for sure: "If God does not exist, then everything is permitted". In the transcendent reality we can not see nor fully understand God but somehow looking around us and listening to our inner feeling each person should be able to come to recognise the Supreme Power and to understand that reality is shaped by a Power beyond us.
When men let their faith and confidence in the credibility of the Word of God get away from them, there is danger of lowering their ethical standard. A tottering faith in the Bible narratives shall bring morality to be unstable and to stagger also. When there is a rejection of the integrity of the Old Testament narratives there shall be no vibration to come to see the truth of this life and the person shall move or sway unsteadily or unsure in this materialist world were more and more people are moving away from God and are having their egoism being the base of their life disturbing their relationships, making them unstable.