I would only pray in a Reform Temple or a Conservative one. Ethical Monotheism. The energy and teachings of the Sitra Ahra (Dark Side) got totally entwined with religious Judaism.

Reform Judaism is right about Ethical Monotheism. This is first of all true. [One of the major goals of Torah is objective personal ethics as you can see in the Ten Commandments.] Also it is what the Torah is about.  But Reform is wrong in ignoring the Oral Law and the efforts of the  Sages to understand Divine Law. Also-It is bourgeois. They have no Gra, or his disciple Haim from Voloshin, or Isaac Luria, Israel Abuchatzeira. No juice. No taste. The batteries need charging.

Reform  ignores the most important aspect of Torah,- the holy numinous aspect.

There are a few people in the context of Torah who discovered and  revealed parts of the divine reality contained in Torah. They were the Rambam and Ari (Isaac Luria), the Gra, Israel Salanter,
Also "social justice" is an 1840's invention of two Catholic priests meant to replace noble obligation (Noblesse oblige). It is not the main idea of the Torah, nor the Prophets, nor the Writings.[, תורה נביאים כתובים]  Social justice is the opposite of justice. Social justice is steal from the rich. This is based on the idea that the rich must have somehow gotten rich in some non proper way even if there is no evidence for this. Justice means don't steal; not from the rich and not from the poor. Simply don't steal.

In spite of this, I would only pray in a Reform Temple or a Conservative one. I would run from the "religious" like one runs from a charging leopard. That is just how frightened I am from them. (This is not irrational fear. It is fear based on personal experience and observation of what I see they do to people. They make a tremendous effort to make "baali teshuva" (to make people religious) and then destroy them systematically.) [But one does have to learn and keep Torah. To learn Torah you should take one page of Gemara and keep learning it day after day. That is read it from the beginning until the end with the Tosphot and Maharsha--every day the same page until something gives way and you understand its depths.  This is  the "in depth" session. besides that you need a fast session to get through the  Oral Law- Bavli, YerushalmiTosefta, Sifri and Sifra. But you don't need to go anywhere near a religious synagogue, Heaven forbid!]

And it would not matter if the only mikvah in town was in an religious synagogue. I would still simple refuse to go anywhere near the religious. [I would go to the ocean.  When I was in the mountains there was a nearby stream which I dug deep into so it could be used for  mikvah.
The Sitra Achra (Realm of Evil) just got too much intertwined with "religious" Judaism until it is impossible to separate the two.

This fact is hidden to many religious  people because they think their approach is based on Talmud and Halacha. They are unaware that it is not based on Halacha at all, but rather it takes a few  rituals to cover up what is really going on.

 What makes this almost impossible to know is that people today rarely every learn the books of the Shatz and his prophet Nathan from Gaza. But if you have had the sad experience of  reading those misguided books, then you can see right away how the most basic teachings of the Shatz are part and parcel of Religious Judaism today.

[If I was back at Beverly Hills I would not drive to Temple Israel in Hollywood on Shabat. I would stay home and learn Torah. But I would make an effort to be part of a Conservative, Re constructionist or Reform Temple during the week. The trouble with driving is that it involves  fire. I learned that in a high school physics books about how the spark plug and the four- cylinder car engine works. If it would be just electricity, that would be allowed.]

In sum: Reform is right about some things but wrong on others. My younger brother in fact goes to a conservative shul. But there are things I think conservative have also gotten a bit wrong. Personally I just can't see anything as good as a straight normal Litvak yeshiva.

1) The major support of Reform and Conservative Judaism comes from Musar (Ethical) books of traditional Judaism.
I mean the major principle of Reform Judaism is what? That between man and your fellow-man comes before between Man and God. This is the exact principle of Musar.
 "You should walk in his ways, and keep his mitzvot."
The command to walk in his ways we know is the commandment "What is he? Kind. So you too be kind."
R. Haim Vital, the disciple of Isaac Luria, in chapters one and two of his Musar book Shaarei Kedusha makes the same point. And the great Yemenite Kabbalist, The Rashash (R. Shalom Sharabi), goes into this exact point in detail. He says the soul of a person is his character traits. The mitzvot are simple the clothing and food of the soul, but not the soul itself. [נפש השכלית]
Reb Haim Vital says, "One must be more careful to stay away from bad character traits than be keeping positive and negative commandments, because bad traits are very much worse that sins."
There is no clear connection between being religious and being a decent human being. It is clear from that that the religious world is not keeping Torah properly. Fanaticism is just a cover up for something that is not Torah.

2) The major problem with the religious is not so much in places where there is a strong Litvak yeshiva presence. For example in Brooklyn where the three major Litvak yeshivas are located {Haim Berlin, Mir, Torah VeDaat} even local shuls (synagogues) tend to be straight Torah oriented.
3) The main problem I see with the strictly religious  is the idea of a עיר הנדחת a city in which false gods are worshiped. The law is that the city is destroyed--everyone  and everything. The reason being that even the tzadikim inside the city acquiesced. That is they did not actively protest or simply leave. Only Rav Shach saw the problems and objected.

[I hope it is clear what I am saying. If I would have  A Litvak yeshiva in the area that would be one thing. But the religious world outside of that is very insane. And sadly to some degree the insanity has penetrated.]

Another problem with the religious is  the desire to rule others. They invariably ruin everything they touch. 

Another point is that prophet Jeremiah says חרפת עולם אתן להם (an everlasting shame) about Klal Israel. That means that almost any involvement with the religious be definition brings about involvement with the Dark Side. I thought I could avoid this problem by sticking with the most straight form of Torah--the Litvak Yeshiva, but there also (sadlly enough) the Sitra Ahra managed to find a way in.